"A $50 piece of software is worth what you pay for it 10,000 times over if it even improves your win rate by 1% (and Poker Tracker most certainly does much more)."

hehe - there's a big "if" there: if you play enough and if you use the info. I bought PT 5-6 yrs ago and I don't play anymore. A 1% improvement over 400 hands won't make my $50 back at the low limits :)