Hello Andy
You have posted a very interesting question. I had many thousands of pounds worth of one to one franchising advice from one of Europe's most highly respected advisers.
I was seriously going to do a whole lot of weekly posts of what Franchising is about and the details of how you go about it. I wasn't sure if the demand was out there. Let me know and I will gladly part with all this advice free of charge.
With regards to your question, the answer would be part of my posts, but remember if you have a franchisee who has a limited threshold you are laughing but how would you feel if a franchisee was paying you a set fee per month and grew to three vans and a hutge turnover?