I am a serial owner. I can't own them all...not all at once, anyway.
Seriously, I think I have owned close to 75 handguns in the last 25 years. Sell one, buy one has allowed me to experience almost 20 S&W revolvers, almost 25 1911s, and a bunch of others.
Do I regret selling any? Only a few. A six-inch S&W M57 and a Hamilton Bowen-massaged four-inch M25-5 are two I think about from time to time, but honestly, they did not get much exercise. If I can't (or don't) carry it or shoot it at least somewhat regularly, I will sell it and move on.