I've got my collection down to 30 tarot decks and 29 oracles. This is down from a peak collection of around 200 decks total. There are still several decks I could get rid of that I never use.
Most of the money raised from the deck collection have gone into the board game collection, which has gone from 0 in February to 37 (45 if you include expansions to base games). We're very much enjoying our new hobby. It's nice to have something we can do together.