Is Tom Lee Wrong? Betting with $15 Billion Against the Diversification Investment Theory

The crypto market has recently experienced another period of intense volatility: Bitcoin has fallen below the $70,000 mark, and Ethereum has also weakened simultaneously. In this environment, two of the most “flagship” figures are under nearly public scrutiny: Michael Saylor (formerly of MicroStrategy), and Tom Lee, whose Ethereum reserve strategy is deeply intertwined.

The controversy centers on a straightforward issue: these two companies have almost all their balance sheets concentrated in a single asset. BitMine (BMNR) disclosed that by early February 2026, its Ethereum holdings exceeded 4.28 million tokens, accounting for approximately 3.5% of Ethereum’s supply at that time. Based on this, it is estimated that after recent declines, they are sitting on an unrealized paper loss of around $6 billion. On the other hand, Strategy’s Bitcoin holdings as of early February were approximately 713,502 BTC, with an average cost of about $76,052. At the time of writing, Bitcoin was hovering around $69,000, naturally amplifying the perceived pressure of their “underwater” positions.

From the perspective of modern portfolio theory, such over 90% single-asset exposure appears to be at odds with diversification: diversification typically aims to increase expected returns at the same risk level or reduce volatility at the same expected return.

So the question arises—if “common sense” is so clear, why are they still highly regarded and even celebrated within the industry? Are they wrong? Should ordinary investors follow their lead?

I believe that to answer “whether to follow,” we first need to understand why they are able to do this, and the three-layered logic behind such strategies:

First, this is a “large share” strategic trading task, not just simple investing. Strategy positions the company as a Bitcoin reserve vehicle, while BitMine aims to be a representative platform for Ethereum reserves. One purpose of concentrated holdings is to secure a significant share within the supply structure, thereby gaining greater influence and narrative power in financing. Strategy has already become the largest holder among companies, and BitMine, under the PoS mechanism, can further amplify its “network influence” through staking and ecosystem collaborations.

Second, they are not just buying tokens—they are also buying “brand narratives.” When “X increases holdings again” becomes news itself, the market response can have a self-fulfilling component: expectations of more capital following, short-term demand curves steepened by narrative. Reports about BitMine repeatedly emphasize the amplifying effect of “the act of increasing holdings” on market sentiment. This intangible asset value is difficult for ordinary individual investors to replicate.

Third, modern portfolio theory is about statistical advantage, not guarantees for every sample. Diversification enhances “long-term, probabilistic value.” But within the sample space, there are always a few extreme cases: taking on very high concentration risk, which can ultimately lead to equally extreme returns. Saylor bets on Bitcoin as this “extreme sample,” and Tom Lee on Ethereum—winners and losers—shaping their rise (of course, they are now also in a paper loss stage, meaning the cost of this “extreme odds” is still being realized).

Now, returning to the most practical question: Should ordinary people copy them and go all-in on a single coin?

My cautious conclusion is: individual investors cannot gain bargaining power from “large share” strategies, nor can they extract extra premium from “brand narratives”; what you are left with is almost only the third point—pure high-volatility gambling. Moreover, if you bet not on BTC/ETH but on tokens with worse liquidity and survival prospects, long-term statistical evidence suggests a higher risk of deteriorating risk-adjusted returns—Markowitz’s Efficient Frontier theory remains quietly valid. Even holding only BTC or only ETH may not outperform a diversified, multi-asset, multi-risk-factor portfolio (entry price and holding period will influence the experience).

I understand that the crypto community finds it difficult to diversify long-term: most tokens tend to correlate during stressful periods, limiting diversification benefits. But we are entering a new phase—deeper integration of crypto markets with traditional finance, with more configurable risk sources on the trading side (including tokenized stocks, commodities, indices, and even currencies). As the investable universe expands, there is no excuse not to diversify; instead, diversification should be regarded as a discipline: using small positions to buy asymmetric upside, structuring allocations to control drawdowns, and managing tail risks through cross-asset correlations.

What is worth learning from them is not their “full allocation to one coin,” but their systematic approach to asset-liability management, financing channels, narrative control, and long-term execution. This is an institutional game, not a copycat challenge for retail investors.