Well, I don't see it wrong if you want to monetize bitcoin as an exchange for your services. I believe it exist for it to be used as an exchange as an alternative. As long as you follow guidelines provided by your country regarding fares, taxes, and other services I think there's nothing wrong with that.
I fully support this opinion. This is your work, you are not a volunteer. You make seminars and trainings so in my opinion providing of monetization is right, but do not be greedy, make the price acceptable