Clipsforsale is actually a fairly popular and trusted site, and yes, because of its niches and fetishes.
That is why the site has lasted for a while and has so much support from the models.
It's very pricey, because you're looking at custom and or niche content that's anywhere from $5 to $100 PER CLIP.
If you're a mainstream porn viewer, you're probably not going to find anything of interest. But if you're hardcore into fetish stuff, and value the full attention of a cam model (and who customizes it for you) you are going to pay that price.
It's side by side with findom, because the people who pay are happy to part with the money for something very specific.
The site is trusted and is actually popular with models because of the freedom it gives them and the higher royalty payout.
I think it's something like 60% royalty on clips, 75% on videos/DVDs, 80% on tributes, and that's pretty good for the industry.