I've met other cachers at cache sites, and after seeing their kids' eyes light up when they see the toys, I now gear the items I leave toward kids.
The fun for adults is (or should be) in the activity. Those who think they "deserve" some valuable reward for their efforts should sell their GPS, use the money to buy a metal detector, and scrounge for beachgoers' lost watches and rings.
We enjoy finding the worthless little knickknacks and trinkets. We have a large wall unit filled with small items we've collected over the years: gumball machine items, Crackerjack prizes, fast food restaurant kids' meals toys, etc. Some we bought and some we found geocaching. We trade them when caching and our display is always changing.
