I know what you mean. I sold mine last year as I felt I wasn't using it enough to justify the huge deprecation curve. Capable machine, I did enjoy owning it, but not quite practical enough for daily use with a family (not that I have one), but not quite special enough for the weekend either.
I've been observing M140i/M240i's for the past year, the lockdown has actually had a positive effect on the price, as 2nd hand example went up. Before I imported my Chaser you could grab one for 14-16k fairly easily, now its more like 18-19k+... If insurance wasn't a... I would have grabbed one, but paying over 1k for insurance is just silly.
M2's have had a nice bump in price too! So many guys on the forums sold theirs to WBAC, their prices for pre-facelifts are crazy. Idk how they make profit from them...