Details man, we need details! What did you sell? What did you
buy? Then, maybe we can help you.
Yeah, what He ^ said! The suspense is killing me here!
I've been slowly parting ways with most of my plastic guns lately, and generally replacing them with S&W revolvers and 3rd generation (mostly) semi-autos.
I've even considered doing something along the lines of bushmaster1313, and just turning 2-3 so-so firearms into a higher end 1911, or a spectacular "something". But not for "collecting" per say, but for shooting and caressing.

The only plastics left in my safe are an FNX 40, a Beretta PX4 Storm 9, my EDC Shield 9 and a Glock 19 I traded into (to try one out, but haven't yet). Oh yeah, I almost forgot my plastic rifle, the CX4 Storm, but it's a great truck gun, so I'll probably keep it and the Beretta 92 that shares mags with it.
I used to shoot all of my guns pretty regularly, but now I have a few of them I've owned for a year or more, that I've never fired. So I guess it would make more sense to do as the OP said, because there's nothing wrong with slowing down a bit. I still enjoy my firearms and much as ever, probably even more than ever. However I don't have the urges to jump out and buy the newest and latest one to hit the market. It could just be, they just don't make nearly as many "Purty guns" as they used to.