If you really like the gun don't sell it ...
For instance 10mm never caught on but I know many folks who still still shoot it. Granted, most of them are reloading their own ammo but some love it so much they buy ammo in bulk.
What are you paying now for ammo? I'll see what I can find. I don't shoot .45 GAP but I do buy my pistol ammo (.40 S&W, .45 ACP and 9mm) 1,000 rounds at a time. You get better deals that way.
BTW - If anyone out there needs 3v Lithium CR123 batteries for tactical lights the best place to buy them in bulk are
www.botachtactical.com - 20 batteries for $20! Sometimes they even have a special 30 batteries for $25! These are good batteries, too.