I must be a cold heart'd person.... I've never had the desire to want to buy back any bass that I've sold. And I have sold basses that I said I wouldn't sell!!
Is it just me?
Not coldhearted, more that you perhaps recognize there are plenty more bass in the sea (seabass?). I impulse-buy, but seldom impulse-sell, making sure I have good reason(s) to remind myself of after the sale. Like my first (and best-sounding) mid-1990's Roscoe a few years ago, only sold because it had a slight twist in the neck (repairable). Life's too short to look back with regret, and ultimately instruments are just tools to use, not significant others to get attached to/jealous over.