I'm pretty much a minis addict too. I started about 6 years ago on Ebay and found tons of painted metal minis for sale. I soon found Reaper and started buying those, and while i have a lot, it's nothing huge. A couple hundred maybe. I was slow jumping on the WotC pre-painted bandwagon and missed out on a lot of the early sets.
This...missing out on minis i wanted...this is what spurred me to snatch them up in multiples so it wouldn't happen again.
I also like making my own sometimes, or modding others. It really is a hobby within the hobby, but i have plenty of time and no kids or school so it's not a big deal.