I can't believe that after 30 votes only myself and 1 other person goes through more than 10 decks a month!!! I understand it can depend on your income if you don't live in the States - 2 decks for like $3 or something (I live in Australia tho)
But if I'm not working or doing something (else) important with my hands I'm fanning, passing, cutting, colour changing or just annoying other people with my cards. After a few rough days with a deck it doesn't perform anymore so I stick it in a draw for when I need to do a TNR or use a dirty key card.
I do have some performing only decks which will last for ever tho.
Oh and DLeerium, goto
www.acekicker.com.au, I've just started buying my regular bikes from there, $6.15 each, not as cheap as
www.kardwell.com but kardwell charge $50 for UPS international shipping.
$15 (approx 2 1/2 decks) a week for a hobby isn't that much if you love it!