I personally don't think there will be a great deal of scalping Seinfled tickets, the U2 tickets were over promoted, and people promised tickets by U2 were denied tickets (a promo blunder), thus they drastically increased the amount of interest in their show (which is very high in general) and decreased the expected number of tickets, simple law of supply and demand. While it'll work for rare concerts, high profile concerts, high profile sporting events, I would think that for Seinfeld, you'd stand to either lose out or make a little (not nearly as much as U2 tickets went for) at best.
But who knows, I've personally never heard of people buying scalped tickets to a comedy show, but I guess anything is possible.
life is too short to have any regrets