Getting back to what the OP was talking about: Franchising is much more about lifestyle than high profits. I've no doubt that Purple Rhino etc are making fantastic money with their 'one-off' style of working, but that needs very high marketing input and constant management to maintain the level of top paying jobs and the quality of work to achieve the best profit from each individual job.
If James were to franchise his window cleaning then obviously he would not achieve the same profit that he would by being 'hands on' and paying employees, but when each franchise is 'full' there is a reliable income stream for very little input.
Comparing franchising with high-end one-offs isn't the point, it's about not having to spend hours on end on marketing, admin (tax/ni deducting, vehicle maintenance, record keeping, allocating and managing daily workloads, invoicing, accounting, insurance, etc etc.) but providing franchise owners with the wherewithal to run a regular lucrative business of their own and paying a 'royalty' to the franchisor.
A properly organised franchise business will provide the franchisor with a very good income (keep appointing more franchisees till the desired level of income is achieved) with minimal admin requirement on the part of the franchisor, leaving him free to follow whatever other business activities he wants.