Nah not at all
Just like the old bartering really
You go and do a clean at the local, butchers, hair salon, beauticians, local electrical place, independent chemist, local tourist attraction, any independent business at all. In return you ask them for a prize to the value of your clean.
So your local butcher might for example give you the value in goods of what the clean would have cost you.
You then put that on your website (if you have one) This months prize is in Conjunction with Will Brown, local supplier of fine meats bla bla......
You put a link to his site if you can. Alternatively on a leaflet that you have local businesses that supply prizes
He wins he gets a clean, he gets his name on your site, and then you do the next month with somebody different.
Might help new people to join, because its just a wee incentive, and might keep current customers happy?
Just a bit of fun maybe and also a little bit of a puller with new people, community thing etc.
Just a thought.