Hmmm...

When you have 35 CD-RWs full of V2 clothing, morphs, hairs, and settings; do not have V2 installed in your Poser runtime and have3n't for over 2 years, but refuse to format them because... Someday.

When you have over 70 gig of V3 items, most of which you haven't even unzipped and put into any runtimes yet.

When you start collecting stuff for V4 and/or P7, and haven't even purchased teh base models yet. (This is more for P7, which hasn't been shipped...  Yet.)

When you think to yourself "Self, this is really cool." Quit your job and spend 60K on a game art & design degree so you can learn how to create  clothing, and hairs, and settings and whatnot, for... whatever poser version you currently have loaded.

When you realise just how much time you actually spend each day, sitting in a chair, fiddling with morph dials.