Limit rate? I don't think we have one. For us, you pay a certain amount, and the amount you pay is what kin dog work you can see. Like if you pay $2 a month, you can only see all sketches (except NSFW sketches) If you pay $4, you can see outline liners and sketches. Pay $8, and you can see all that and see complete colored versions as well. And if you page $15, you can see all images, including NSFW pieces.
The options above that are if you want to get monthly commissions.