I would say, that people join pay sites in order to 'own' the content. I will save pics all the time, often not looking at the pic at all, but its fun to know I have it.
If I joined a site that did not let me save pics, then would soon cancel. But often you can find ways around it. At worse, you just get a art package that will do screen saves, then crop the pic.
It would be like paying for a TV station, then finding I could not record a film from it.
The simple option is put your web address on all your pics. if someone does post them, then its great advertising.
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