Depends on how exactly do you "signal that you understand signalling". The problem may not be the topic being signalled, but choosing a wrong way to signal it.

For example, if you are frequently seen with attractive sexual partners, then I think it will not make you look bad if you admit that you have some cool know-how, and you are willing to share it for a lot of money.

On the other hand, if you are never seen with attractive sexual partners, but you talk all the time about the know-how you have from internet, even when no one is willing to listen... that is very bad signalling.