I'm not quite at these levels, but I'm currently at 9 bikes locally (+2 "zero" bikes at my parents' house) and 6 frames. But I'm likely moving soon. And probably to a smaller space. So I need to downsize, even if my collection isn't outrageous.
I will say that I struggle a bit since I'm quite tall -- which means that there's a more limited supply of used bikes and frames. So when I see something available that I'm interested in, I'm very tempted to pick it up because I don't know if something similar will come back up for sale again. And then, once I have something, the supply of other riders interested in buying is also correspondingly smaller as well.