Not really. At least here (in Germany), they have promotional toy lines derived from well-known brands (e.g. I saw a store display promoting Powerpuff Girls toys in Kinder eggs a few days ago). The ads tout a guaranteed probability of finding one of these promoted toys in the egg (every 7th egg wins).

There is a vivid aftermarket for these promoted toys. They're worth more if you collect a full set.

You're right insofar as the non-promotional toys are pretty much only worthless plastic.