You're absolutely right! It's your product and you can charge whatever you want. Considering that not too long ago you were offering it for free.I am not going into comparison with other courses because I don't think it is possible. Scoring Tools MasterClass is far from being the same thing as what the other schools are offering.
However, if you think the other schools will teach you, for just few bucks, how to sound like, or even better than what is shown in the trailer of Scoring Tools MasterClass go ahead and buy their courses then.