Id say try it for a month - see how it goes and what not. We can advise them on logistics etc, and then only do our own
one more thing, sin is adamant that an ice system is very good since that allows to make our own fuel in system. (disregarding that to mine enough for 1 large tower is well... I think mang knows better than me but I did some calculations on it and it would take ages upon ages upon ages.)
To supply a large with 1 months worth of isotopes (and it has to be that tower = ice, so more expense there if people dont already have the relevant towers) takes at least 5 ice miners working several hours a day EVERY day of the week (hell for me to get the fuel for a med for a couple of weeks or so took like 12hrs on my own!), with in 0.0 case Orca backup for both boosts and necessary capacity to haul it between a pos and the belt etc. Would be easier to just buy the fuel and jump it in.
The 6billion can easy increase to 8-10 or even more for the initial month when you factor in the costs of towers, fuel, and all the man hours spent shifting people.
But as said, try a month - I'll float MAADIs first month, so at least we can go in seeing how profitability can be without taking a dip in the old isk reserves first
*On the subject of chars not been on for ages, i'll get to removing roles on a few later, and they'll be gone 24hrs after that - each with a mail explaining ofc. I'll also be dropping Ammiks roles, im moving her to another account anyway (to train more of her hulk skills then sell I think, or retask her into combat, I dont know yet), so thats 1 less char shortly.