I'm sure you had many happy times playing with your toys, and doubt you knew of the word investment back then!! So at least you have those nice memories to hold on to,
The limited edition pieces were limited to members which was open to anyone to joined, so it wasn't limited really. I even saw some second hand dealers say on their website that they're currently not buying limited edition pieces from people because they have so much in stock!! Looks like I'm not the only person trying to flog my collection.
I had teenage mutan ninja turtles as a kid and as I remember, I found them very challenging to play with - like I didn't have the imagination to smash them together and pretend they were fighting. Lol. But also, keeping them in the packaging never even crossed my mind.