My name is Jo & I'm a tarotholic.
Whether you read professionally, or purely for yourself/friends you can only use 1 or 2 decks at a time, as you get to know your 'reading' cards you will probably read with others less.
I love Chimera68's comment about calories!
I have over 200 decks & more on their way, pre-ordered & Kickstartered! I have 20+ on my Amazon wish list - these are the ones I convince myself I can wait for, I don't buy them straight away, which shows restraint, if I can exercise restraint with those decks then the others I must really want...need! So I deserve them. They are my treat, plus chocolate.
I only read with 2 specific decks for my clients, I may occasionally read with another deck for myself. I'm a collector, some decks I open, look at once, don't even shuffle & put them on the overflowing shelf. I have to remind myself to look at them again, maybe even do a reading with them... That, I guess, does make me a hoarder.
I did stop for a few years, after being made redundant & deciding to become self employed. I got rid of the credit card then, never replaced it. I had no idea at the time that some decks might go up in value - there's some justification in that, surely? So, I decided I could afford to treat myself, reward myself, I did make a decision to only buy tarot - no oracle or lenormand decks, so I don't even look at them, again with the restraint! As long as you don't 'go without' anything, bills & food on the table always come first & you don't collect/hoard lots of other things then don't worry, there is such diversity out there - it's good to explore..