Before EBay had the politically correct bs going like not being able to show a swastika on a plane tail and didn't have the abusive fees and 1099 paperwork I would post my older built models for sale. Not only did this generate some cash to buy supplies but it also freed up display space. They went to someone willing to pay some cash who appreciates the hobby but for some reason doesn't build them.
I'm at that point that can't build anything due to no display space available. I'm also trying to thin out my stash by selling some kits. I have some listed in the for sale section in this site.