Kevin O'Leary, the multimillionaire entrepreneur and television personality, has expressed his disinterest in investing in altcoins, emphasizing his preference for Bitcoin (BTC) and Ethereum (ETH). O'Leary argues that these two leading cryptocurrencies capture the majority of the market's potential upside, making them his primary focus in the crypto space. His stance reflects a growing sentiment among some investors who prioritize established digital assets over the broader array of alternative coins.