USD$18.95 for one month of membership to a long established site within a very small community is hardly a risk. For the record, I've never pirated fetish material. I work on the principle that I dont take from those who provide their products at a reasonable price relative to the cost of production and distribution, spread over the actual unit sales.
From a marketing and promotion point of view I do not feel the SS preview area is anything special, I have found that it is reasonably representative of the content inside on the two times I have subscribed over the last few years.