Actually, there are already many stashes up on eBay right now. That's how I built a stash.
Not only does a stash sit in your closet, or on shelves in your work area, or in some other kind of storage, but stashes circulate. One generation hands kits off to the next. Kits are traded or sold between modelers, or they are donated to our clubs for raffles.
Or, more nobly, they are donated to be sent overseas to modelers in the service and deployed, or to groups for young modelers, to get kids interested in building models and all that goes with it.
So, I wouldn't lament, I'd spend more time on eBay . Or go to shows, if you can, or join a modeling club, or hang out at the local hobby shop, if there is one, even if it's a chain store like HobbyTown, there might be other modelers in the area who are looking to share the hobby.
The bargains are out there, you just have to look a little closer.
Good luck!
Brad