Game Maker games you or anyone else made money off of before?

[Sengir]

I think not many people make games on gamemaker for money, because some people will not take them seriously as a 'proper' game, and also people who can get them onto mainstream markets tend to be able to program/afford programmers.

or i could be completely wrong :p

It's not that they aren't just "taken seriously", that would imply there is fault with the consumer. GM itself is very poorly-made, for instance:

GML is an interpreted programming language instead of a compiled language. When GameMaker creates a stand-alone game, all GML (including drag and drop functions) is packed into the game executable. Every time the generated program is executed, an included interpreter carries out the commands indicated by the GML code; this makes GameMaker-created games able to be easily decompiled and reverse engineered. (Game makers wishing to limit this must use encryption.) Being an interpreted language, GML is usually significantly slower than compiled languages such as C++ or Delphi.

You are sacrificing quality and speed for your ease. This isn't too big an issue if you are giving away your games or trying to make small change on the side, but if you plan on becoming a developer by profession and making a living off games it isn't a very good idea at all.