Just had a look at a few sold eBay listings for some of mine and many are doing very well! I’ve got £1.6k invested and I’ve not done the math, but some items have more than doubled now. The best individual item I’ve spotted so far is the Wall-E which have gone from £39 buy price to £160 or so now (I’ve got two). The Star Wars UCS Slave 1 and Creator Series Brick Bank are doing really well too each looking to be £150 or more over what I paid. I think I’m now at the stage where nothing is actually worth less aside from the 76052 Batman Classic Series which was expensive and doesn’t seem popular, I think I’m £50 or so down there.
By saying that this is just looking at eBay sold prices, that doesn’t factor fees or being ripped-off by scammers etc. It would only take a couple of very bad sales to wipe out much of the profit. No idea if there are better markets to sell in. I would rather like to move some stuff as it occupies so much space, there is a huge mountain of brown cardboard boxes stacked-up in the middle of my bedroom! That’s the thing I didn’t really think through when buying-in!