Legos don't count for me, since I never stopped buying them. Although, since my son is into Legos it gives me even more reason to buy them.
As to what set off my addiction of purchasing toys, it would have to be the 1/60 VF-1S. Once I got that, I had to have more so I got the next two releases of the 1/60. Then came the 1/48 and all hell broke loose, but due to monetary constraints I was only able to get two of those. Then came the reissue Transformers, then the Alternators and now the Classics line.
Who knows when this addiction will end...