I for sure have been there, and it was scary.... But I'd do it again, What a catharsis. Even thouhg I am more a dom by nature, I do submit as well - both roles are totaly natural to me.
The 1st time I got tickled as a "fetish", the first time I was bound, was the worst. 2 women tickled me incredinly, and I finally had to yell "MERCY" and it was NOT a planned, calculated thing... it was true panic... If I had any secrets to give, they would have had them in a matter of minutes because they just would have been blurted out. I was broken in the truest sense in that I no longer had control of my body or mind and I was near crying with frustration and fear..... and as terrible as it was, I'd do it again. What a rush of emotions and brain chemicals!
Fear and an sense of being unsure play a part.... it was my 1st time tied, and one of the women I did not know. Also, how much could I take, how long would the tickling last? 5 minutes? 60? These questions were unanswered, so the fear element of it going to far was real. And to this day I can't really define what "too far" is..... To make things worse (or better) these women were not into tickling per se (just dominance) so there was no real teasing or testing or anything, just an all out onslaught to make me react, making me their puppet as the whipped me into a freny I couldn't control. Somehow, that made it better..... I also was tickled by a Korean woman once who didn't know when to stop... she loved dishing it out and didn't understand that sometimes when I said "stop" that was just my natural reflex reaction taking over and I really wanted it to go on.. and sometimes when I said stop I really needed it to stop! She just didn't comprehend the difference, so it was like a real punishmnet/torture. She kept saying, "oh, you like this... but you like it..." nott understanding that the "Like" part of the tickling experience was over past, and I was now into the just-trying-to-endure-it stage. Luckily, I wasn't tied on that occasion and could get away as needed.... but didn't really need to.
So, when I get to travelling again next year and go to some of the gatherings, I hope to undergo another true "take it to the edge' session with 2 or three ladies... bound tight, and me not really knowing who they are or what's in store.. that slight fear factor is truly important. Even though it REALLY scares me, I'd like to play with the idea of someday being tickled to the point of using a safe word, then being tickled a litlle more (a LITTLE more) beyond the safe word, the tickler(s) showing me who's in control).
But then, I am a dom as well, and I look forward to doing the exact same thing on a helpless victim, or victims.... revenge will NOT be sweet!