I guess it depends on how you define worth it, too, which is going to vary between individuals. Folks making big money may not be all that interested in picking up a few extra $, whereas those looking to build some extra income, maybe as a sideline, probably wouldn't turn it down.
My first adult site targeted a fairly popular niche that had several galleries and some other sections. It was a bit of a confused site, too big to be a standard freesite, too small to be any kind of authority in its niche, and most of it never made much money. But one section targeted a pretty specific "micro niche" within the overall subject, and, after it listed for its keyword, it routinely brought in about $100 per month from a set of three or four pages that I never touched again once I'd built and uploaded them.
Not a huge sum, by any means, but to me it was worth it
Should be interesting to see how the OP's experiment works out!