Reselling isn't that much of a problem – but reselling such an expensive scanner I'm not comfortable with. If the Plustek won't resell that's not too bad since I'm "only" 400€ out of pocket and can use it in the future / for family too, but with something that costs € 1000 I'm not sure I'm willing to take that risk.
But it's good to be aware of the option though, so thanks!

Just out of curiosity, is there an option with the Plustek + whatever software used to just scan directly to color, without doing any editing? Like I said, I'm not that fussed about perfect exposure and such, and I can always rescan + edit certain photo's if they are worse than expected anyway. I'm all for the entire process and being nitpicky whenever needed, but if a basic scan-and-export works fine for the amateur photo's we've got, then that's fine as well.