Most kids have way too many toys..........it's simple, really, they like them BECAUSE they aren't bright and pretty and make noise or roll around!
Same reason kids like the boxes toys come in better than the toys themselves!
Saying that, I am trying very hard to clean out my kids' playroom, and darnit, I have a hard time getting rid of any of the toys they don't want. The ones they don't want are the expensive open-ended ones that I want them to have. The ones they do want are the one-armed GI Joe copies and the Planet of the Apes guys...................that I'd just as soon get rid of!