Most sites will take a max rake out of each pot of $3, with less being the standard depending on the pot size.
My understanding is that the rake a site takes from each pot is extremely prohibitive on your potential earn rate, and doesn't begin to level out until you are playing the 5/10 limit or higher games.
Here's an example. Let's say you're playing a 2/4 game with an average pot size of 10bb's, so $40. If the site rakes $3 that represents 0.75 bb of profit at that limit.
Now, if you're playing a $5/$10 game and the pot is $100 and they take $3 out, that represents 0.30 bb of profit.
Depending on the games you play, a good player will see anywhere from 1-5bb's/hr, so the more you can lessen the effect of rake, the better.
At a 10/20 game with a $200 pot the $3 in rake represents 0.15 bb of profit and so forth.
Most low limit players can add an extra 20 bucks to a few hundred each month, depending on the limits they play, how often, etc.
I personally maxed out around 1500-2000 in one month, but regularly made 800-1200 multi-tabling the 10/20 and 15/30 Omaha hi/lo games. I've seen some players who made 3-5 grand or more every month on a regular basis, just in rakeback alone (but they're hardcore, so don't expect to be there yourself for a long time, if ever)
I am not a rakeback provider, but my site does have information on them and frequently asked questions about rakeback.
Pokerstars does not offer rakeback, and is pretty stingy on deposit and reload bonuses as well, although their player points system is well liked (I'd rather have cash myself though)
Full Tilt has rakeback, but they deduct a lot of stuff from your MGR (monthly gross revenue), so players new to rakeback get all frazzled when they aren't bringing in tons of money right away with
FTP because of their deductions (an affiliate can explain the deducations better, but in the end it's still better than playing without rakeback, and
FTP is one of the larger and more active sites, so better table selection)
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