Although I know you are not asking for advice I would encourage you to join and enjoy the adventure.
It is true that there are elements that are not favorable such as not getting paid or having to use part of his vacation time for this. But, you will be in one of your favorite activities, with people who are important in your life, you will have the possibility of access to a group of "royalties" as part of the sponsorship and, in the end, you will have fun.
Anyway, I wish you the best in this adventure that I would call "VICTORY".
Happy journey.
Cheers and best regards.