Here's one more angle on stock splits from
Investopedia(!):
"Another reason, and arguably a more logical one, for splitting a stock is to increase a stock's liquidity, which increases with the stock's number of outstanding shares. You see, when stocks get into the hundreds of dollars per share, very large bid/ask spreads can result (see Why the Bid/Ask Spread Is So Important). A perfect example is Warren Buffett's Berkshire Hathaway, which has never had a stock split. At times, Berkshire stock has traded at nearly $100,000 and its bid/ask spread can often be over $1,000. By splitting shares a lower bid/ask spread is often achieved, thereby increasing liquidity."