It would be moronic for most investors to purchase 100 shares at $148,32. If I were to do so, I would be very overweight on one stock. Any investor with that little diversification is not very bright.
Proper sector diversification and risk mitigation takes a significant amount of money... playing math games with splits doesn't change the viability of the operating returns generated by a company, and institutional buyers who make the market generally know that.
My point is that investors who saw Munger and Buffett's business acumen and recognized it as being better than their own have been handsomely rewarded for getting on board years ago and sitting tight....
Berkshire is itself more diversified than most people could themselves allocate... with around 500 subsidiaries in all kinds of industries and a number of major stakes in companies like Coca-Cola, American Express, etc.
The company has grown the per share book value of its investments 22% year over year, annually compounded for half a century. It's own share price has tracked very closely to its book value, rather than seeing volatile and irrational bubbles and bursts... and consequently has snowballed a staggering 490,000% cumulative return since 1964.
Find me a single fund manager who could have even come close to that with their own picks.... I can name at least two, and neither of them will talk to you if you have less than $30 million to invest anyway.
If that's not you, my advice is to put your money into an index fund and sit on it.... Unless you really can beat the S&P year in and year out, in which case you ought to be an investment manager at Berkshire...