I have often wondered this myself - especially after seeing/hearing all the "licensed ham operators" bash GMRS and GMRS users and preach to us how horrible GMRS is and how much better life would be if we would just "get our ticket" and use a "real radio".. Of course, when we try to point out that GMRS does exactly what we need, they respond with something along the lines of "oh, you're just too stupid to take the test"... Then we have to listen to them tell us the stories of how they got their H.A.M.s license when they were only 9 years old and didnt even have to study.
OTOH, I have also heard and read about "licensed ham operators" slumming on GMRS just so they could quote regulations, complain about spurious RF emissions, and failure to use GMRS callsigns - as if they are some kind of self appointed radio-police..
Basically, it seems that many (of course not all) are just sad, broken, sociallyretarded losers, trying their best to try and let everyone know how smart and powerful they think they are.