I haven't bought a physical comic of any kind; back issue, new comic, trade collection, since the last LSCC at London Excel. Judging from reports posted by boardies about the MCM conventions, those still have a way to go to offer something similar to LSCC, but, in any case, I doubt I'll attend another large convention.
The dealers appear to have moved onto much more deep-pocketed individuals, and that market is quite unaffordable to me. I find that when I read a digital version of a story I have a nostalgic fondness for, that it often isn't quite as good as I inaccurately 'recalled' it to be, and I can live without a physical copy. There's no longer a need to comply with the demands of an extortionately-priced secondary market.
Same thing with new comics. I'd read a trade paperback or hardcover collection and wonder if, in the final analysis, it was worth even the convention-discounted price I'd paid, and ended up, after LSCC, being far happier buying those stories in a much cheaper digital format via Comixology or Humble Bundle. The same type of material I'd look for at cons, but a far wider range.
I won't miss the social aspect of conventions. The experience is far too overwhelming, non-stop autistic overload, and I've become increasingly disinterested in returning to that onslaught. Much happier with the calm and detachment of getting my reading material without all of that stress, without even needing to leave the house, something emphasised even more by lockdown. Interesting to experiment with the social experience, but it really doesn't work for me. I would guess that it's not only the back issue market that's been evolving dramatically over the last five years: I have too.