I did similar - mined ~50BTC and sold them almost immediately for little over 1USD each. Stings a little TBH, but I stand by my reasoning at the time (cash now is more valuable than potential cash in the future [I was broke at the time], and I didn't expect Bitcoin to be more than a bubble).

I do now have a server mining Monero which I'll probably hold on to for a longer term though (I'm paying a fixed fee per month for it, so when it's otherwise idle it doesn't cost anything extra to start it mining).