Binding and/or tickling someone truly against thier will is another story altogether, and wrong.
I think what Aphreal was implying was the "act" of being non-consensual, or something like that. I have had 'lees who loved bondage, but weren't ga-ga over being tickled. That didn't mean we didn't do it, but it wasn't the same as someone who "loves it, craves it...", that sort of thing. As part of a D/S session, there are things that the Sub isn't in favor of, but that's the point. All withing the confines of a trusting relationship and predetermined limits, of course.
There are the "Tie me up and tickle the shit out of me!" types, and the "I don't love tickling, but I don't hate it either, just don't go overboard" types as well. Many times, I've had girlfriends who liked being tied up, but hadn't played with tickling before. That's where you experiment. Keep the relationship growing. As my pal DVNC would say...it's all about the love, man!
I guess it depends on the two people doing it, really. It can even change within the confines of one relationship. One of my ex's loved being tickled in bondage, but we also did a lot of role-play where she'd be begging and pleading for me to stop. Depends on the mood.