This is good advice. (Look for the link that says 'Edit Campaign Settings' on the campaign page.) If your budget shows as 'OK', it is quite possible that raising your budget from $30.00 to $99.00 will not actually result in an increase in traffic.
If that turns out to be the case, then I'd suggest considering using more keywords, so long as they are still well targeted.
Even better would be to organize your account around extremely targeted Ad Groups. In this scenario, each product or service that you offer has it's own Ad Group - with a crisply written ad about that one thing, and a carefully chosen list of keywords about that exact same thing.
BTW, silverbytes, I noticed in another thread that you were looking for good AdWords resources. In my opinon, an excellent (and free) resource would be the AdWords Learning Center, which you'll find right here: