If you don't want people to send you ridiculous offers, you need to define what you consider ridiculous. I would personally consider $50/hr a reasonable rate, but some people see that and think it's ridiculous. I've worked for $25/hr and less, but I consider that ridiculously low for what I do now and will no longer work for those rates. I know of developers who get billed out to clients for as much as $250/hr. I'm not there yet myself, but I'm working on it.

So what's your budget? What is ridiculous for you and what is reasonable?