Because all programs aren't created equally.
Since the advent of Studio Traffic, largely regarded as first autosurf program, the last few years have introduced many a get-paid-to program. Some are better than others, while most of these sites don't last for more than a few months, some don't even make it past a few weeks. Reason being? Unstable rebates, inept management, and downright greed.
Typically, the only ones getting rich are the scammers in the industry. These are mostly set up as pure ponzi-type programs offering no real stability or income possibility. To compound matters, admins run programs taking significant portions of the pot, thereby reducing any extracurricular income they can generate, and ensuring that the majority of members will, at some point, lose their money.
PHROA is an attempt to, at the very least, correct the dishonesty and greed apparent in most of these programs. The ROA offered is relatively high, but measures will be undertaken to avoid the pitfalls many sites suffer from.