I agree. Utilize your value and renegotiate the terms of what agreement so that you get a piece of the company down the line. Don't be afraid to also demand that you need to approve of the buyer whoever they may be.
I think thats great. I know someone who uses YT as a genuine source of income. They are not the biggest YT out there but they have enough to make some money and they deserve to be compensated for their work providing all of us with content.