My philosophy is as follows. My desire for fire arms is more centered in hobby than individual purpose. As a hobby interest, I have an urge to try multiple combinations from various makers to experience different levels of performance.
To best facilitate this it is often most beneficial to use the extras to trade off for something different. I try to keep in mind that anything I trade off will not be the last ever made and if I decide i miss it, I can find and trade for another. Recent example, I traded off a sp101 and within a month had another one from a different trade. It takes a bit of patients waiting for the right trade, but the differing combinations I've been able to try for myself has increased by multiples.
In my opinion, if you don't need the cash, look for trades in gear, ammo, or other guns.