I have a rather large collection too. However, my spending habits decrease, the larger my collection gets. I become more discerning and don't buy anything that is remotely similar to what i already have and since the latest releases are mostly generic, i am under no pressure to buy.
Furthermore, i only buy small bottles as i rotate what i wear. No justification needed other than to get all my bases covered for every conceivable situation i may find myself in.
However, if i am forced to start all over again, i know i would have a smaller collection of scents given my accumulated experience and knowledge.