True you can play for more meaningful stakes in FL than in NL, but you're win rates for FL will be dramatically lower. 10bb/100 is considered fantastic at NL, where at FL is it basically unsustainable. A respectable win rate at FL is anything above 0bb/100. Killing the game would pretty much be anything over 2-3bb/100 over a large sample of hands. And of course with FL at lower stakes, you not only have to beat your opponents, but you'll have to beat the rake too.

I play both, and enjoy both games equally. In my experience, there are more fish at FL because it costs less for them to chase. In turn, you will get sucked out on a lot more. The variance at anything under $.50BB can be truly sickening due to the extremely loose-passive play. It gets a tad better as you move up, but obviously the players get a little better and a bit more aggressive.