The money has to come from somewhere, though. It's very expensive to do testing, and if you want to stamp it out from the sport all together (including the 4 rounders), we're talking about an astronomical amount of funds.

If we say the government should step in and do it, what makes you think the tax payers will want to foot that bill?

I think, for the most part, there isn't enough demand. PEDs allow for bigger, faster, and stronger athletes which (usually) means more excitement. They also allow our favorite fighters to prolong their careers and provide us with many more fights.