I'm still left wondering as to applying this info to real-world situations.  Say someone has 100 shares of Intel and decides to "Sell in May and Stay Away."  There's a $7 fee to sell the shares, and another $7 to repurchase the same shares in November.  They miss two dividend dates ( $0.14 x 100 x 2 ).  That's a total cost of $42 in expenses and lost income.

I know that most people have more than $2500 invested, and it's not all in one stock.  But of someone has a hundred shares of 25 different stocks, they're still left with the same cost ratios as above. 

Now add in the a$$-pain factor of buying-selling (statsguy hinted at this), and the gamble of missing a Summer share price spike.

Hmmm.....