Paysite Power: Are You Ready to Invest in a Paysite? is an article on XBiz and is really worth reading if you're thinking about starting up a paysite, or already have one and are struggling to make it successful.

Here's an excerpt:
Does anyone want it? What’s your competition? If you spend an hour on Google and a few big tubes and see lots of your type of content all over the place for free, you may want to rethink things or at the bare minimum, come up with a unique marketing spin. Water companies do this by saying their water is “purified” or “mountain spring” knowing most consumers won’t do their research and realize this means little and is just creative sales fluff.

Before you dump tens of thousands into something, unless you’re 100% positive there’s a market for it, consider promoting a site in your niche as an affiliate. If you can’t make sales for someone else’s site, chances are slim that you’ll be able to do it for your own site either.

The same goes for granular niche/sub-niche content. Make sure enough people are into whatever you’re selling that even with totally dominating your market, you can make more than a trickle of sales each month.
It was written by AJ Hall ...a 15-year adult industry veteran and CEO of Elevated X Inc., a provider of popular adult site CMS software. Hall has spoken at industry trade shows and written for several trade publications. Elevated X software powers more than 2,000 leading adult sites, has been nominated for more than a dozen industry awards and won the 2012, 2014 and 2015 XBIZ Award for Software Company of the Year.