LOL,
and you guys may be wondering why google is a multi-billion dollar business
SEM is not for kids. There are companies spending millions a year on it. I even read somewhere where lawyers in the US are paying as much as $30 for a keyword for a certain kind of disease. Why? because if they sue the company/hospital and win, the millions they will win will far outweigh the $30.
Bottomline: If you are in it to spend $20/day, forget it. Your Ad will feature but perhaps once or twice a day. Serious companies should look at a minimum of $100/day budgets. At least, that is what I tell my clients.