Not necessarily about making more power, but like boostingbuick said, it's about the spark being able to withstand the high cylinder pressure of a forced induction car. If it has to span a wider gap it's more likely to be snuffed out.
I had the porcelain separate from the metal threaded part of the plug. Left the spark plug wire just hanging. Threaded part was still in the head. Another plug had the porcelain spin freely. It was on a set of autolight 24's, gapped at .032. Has this happened to anybody else?