I see your point, but I have another point I would like to add:
If the spectators personally request an effect, and you consent to showing it to them, they are going to know what's going to happen. This will weaken the reactions. Why? Because they know what's going to happen, and therefore will not be surprised when it does. Granted, 90% of the effect, IMO, is the presentation, but no matter how great your presentation is, because they know what's going to happen, it will take away that little bit of reaction.
All IMHO, of course.
Yeah I agree, and I thought about that as well. Some effects I wouldn't do, or I should say most, if they were affected by that. There are a few tricks out there that it really doesn't matter too much if they know whats going to happen, like making a fireball. I mean thats over in like a second anyway. And then they may not know what you did specifically, or you could just do something kind of like it. For example, some people knew I had predicted some sports games, but they didn't know exactly what happened except that I wrote down the scores ahead of time and was right. So if they asked about that, I could do any kind of prediction or mindreading effect, and in their minds they would have seen me do something like they had heard about.
Its not like people dictate what you perform if you go with what I'm saying, its just that you alter your choice of material slightly to hopefully appeal to people a little more. Even Angel and Houdini have done that regarding the public. The public loved Houdini's escapes and transpos, so he performed those a lot in public to try to appeal more to the public, but he still did other things he liked like tying needles in his mouth. Now people want to see levitation, so if you notice Angel does this more and more on mindfreak. But Angel seems to like escapes because he does them pretty often, so he still does that too even though its probably not as popular as some things with audiences now. I just think there needs to be a balance between performing what you want and performing for your spectators to ensure that they enjoy watching what you do.
I would say it needs to lean 85% towards your preferences, and maybe 15% towards what the spectators want to see, give or take some.