In the American:

Neumann and Kenny came up with a strategy to capture the value in this pattern. Consider the day on which [Jim] Cramer recommends Stock A (Wednesday in the example above) as Day 0. The authors say you should sell Stock A short when it opens on Day 1 and cover your short at the closing bell on Day 1. [...]

Following such a strategy for 127 recommendations studied between July 27, 2005, and September 9, 2005, would have produced a profit of $861.32 on an investment of $10,000. That’s an 8.6 percent gain in just six weeks, which, when annualized, comes to about 70 percent. The gain does not include trans­action costs.

Yeah, not including transactions costs makes a big difference. Add in $10/trade for 254 trades, and that is a $1700 loss on an investment of $10,000. And that is before one accounts for the bid-ask spread.

Better answer: if Jim Cramer recommends a stock you want to buy, wait until Day 2 to buy it so the market shakes off the artificial boost he gives it at the beginning of Day 1. No promises that is a winning strategy either.