OE,
No reason why you could not work out a scheme whereby you encourage folks to fly more by making the standing costs higher and the hourly on cost as low as possible.
Have to agree with IO540 that no investment means no committment and that is probably not what you want.
People that can not or don't want to invest in an aeroplane are unlikely to be the ones that will do 50 hours per year. I would not hesitate to suggest that you make the group a fair bit bigger than 6 pilots. In the first year people fly the most in their new mount that usually tails off considerably in subsequent years.
If you double the amount of pilots you could halve the amount of the standing orders and still make the sums work.
By having some capital investment you will have a greater chance that people are committed; by keeping that amount low you will keep control and have the ability to boot out any troublemakers.
Always make sure that all your fixed costs (hangarage; insurance and annual are covered by monthlies)
Good luck!
