Originally Posted by Project-Shadow

Throwing random traffic at your site hoping you'll make sign-ups doesn't work. You need targetted/filtered traffic, although PPC can be seen as expensive it is the best thing for you. Google Adsense is your best bet, to prevent overcharging set a daily limit and tweek your keywords, don't expect to make a profit try to break-even first, then go for more ambitious words etc. Make sure you arent targetting generic keywords as well. I.E Porn. It's amazing how many people cry after their entire budget gets spent in a day, because they chose stupid keywords.