Very good points, and I do agree to a certain extent. Don't get me wrong, I like to use my own patter, but when I read or see some that I really like, every once in a while I'll take that basic idea and make it my own. Again, pretty much all of my effects are all me, but there are a few exceptions, and I'm ok with that... for now, at least.
Oh, there's nothing wrong with that. You know Urban Legend, by Michael Paul, released recently from Mental Playground? It's a razor blade swallowing routine, where you pull the razors out of an apple, and the scripting is about urban legends (specifically the one about razor blades in fruit and candy on Halloween). I got that trick just because of that presentation angle, I think it's the best thing ever as far as the razor blade swallowing act goes. I took the script and stripped it all away except for that part, and then re-built it from there.
People make cool stuff all the time, and there's nothing wrong with borrowing or imitating - as long as it goes somewhere, and you're not outright copycatting.