exactly...you like the idea of it. That is enough to be a BDSMer.
BDSM isn't all about whipping and all that. Instead of Dominant/Sadist we call it Ler, instead of slave/submissive we call it Lee. Thats one of the things tickle fetishists don't think about. I also only liked tying up and tickling when I joined the BDSM community. I had never done it, but after some time I got to experience it alot and I also evolved myself within BDSM.