Don... I played them for a while, and would spend 4 hours making it to fourth, then would come in 3rd, get kicked back down a level, get pissed, and bust out 6th... They're definitely profitable if you've got TONS of time to waste... My buddy just buys into the 4th for $150, and actually made $3000 by winning once and coming in 2nd once... But, he's a better SNG player than I am..
Its just too frustrating for me to sit all day, then get busted out w/ AK v. K2 when he catches his 2, and I'm done...