Space constrained. also if you get too many, you just don't get round to ever using them, and I don't like that. Every 6 months I llook at those I haven't shot for a year, and consider selling them - especially if they are releatively easily replaced. Pistols are easier as they take up so much less space, and easier to chuck half a dozen in the car and go off to the range, or shoot indoors when everyone else is out.
The trend right now is less modern stuff, and more older, interesting stuff, especially the basket case guns that eeryone else steers clear off, as I'm happy to make new parts, weld stuff, whatever to get them shooting again, even if they may never be the most desirable specimins
Always looking for any cheap, interesting, knackered "project" guns. Thanks, JB.