[Not-So-Instant Regret] What's the last thing you regret NOT buying?

jouest thought this was worth mentioning said
2

We’ve all made plenty of regrettable purchases. It’s kind of our business model.

But when’s the last time you took a pass on a purchase and later regretted missing the opportunity, here or otherwise.

(Yes, ignoring your deadbeat brother-in-law telling you to buy Bitcoin in 2015 definitely counts.)