It's true that some lay people do know about TTs, but there are not so many of them. Vanishing silk was the first trick I started doing when I got into magic, and the main reason for it was that I was really blown away when I first saw it. Once I'd learnt the secret and bought a TT, that was the only thing I did for a long time, only because I'd liked the effect so much. Later I realized that TT is not something that is absolutely unknown outside the magic fraternity. That, together with my growing interest in cards, led me to put my TT in a draw and not use for quite a while, except on very rare ocasions. Man, do I regret it now. After a while, I realized that people, on average, like the vanishing silk much better than my most powerful card tricks. We magicians tend to forget that all that matters is an effect and a quality of presentation, not how many sophisticated sleights we can perform.
Just try to remember what impressed you the most before you started doing magic yourself. I am pretty sure for many it'll be those tricks that were perfomed with a TT. So how can it dumb?
Repeat like a mantra: use it properly, that's all that matters. You'll fool even those who know your secret
