I doubt it will earn regfee for you each year.
Unless you build it into a popular site that gets traffic from links, search engines, or word of mouth.
It would take a lot of bumper stickers, put it that way.
That is also an item a limited number of folks would usually consume (buy) one or two times in a lifetime.
And I doubt they will do that from their cellphone.
Keep us posted, though! I do wish you the best of luck!