"All these presets can be freely downloaded from the internet, but, I
spent hours and hours (sometimes even days) collecting and edit the best
of them to prepare a synth Bank for this demo video on YouTube."
Let me see if I understand, you took VZ patches that other people posted for free on the internet, did a youtube video to demo them, and are now are trying to sell the patches?
Is this correct? Or am I missing something?
And if what I said is exactly true, how much are you giving to the sound designers?