You can do what i did , i didn't make them pay in any of the setting up costs , i built everything and i have free electricity , after building everything i charged them 1/3 of thier profits to host the rigs in my place and taking care of everything and the offer was fair enough for them.
i would never host anything if you are asking 33% of my revenue, this is stupid crazy man, would kill my profit 100% and roi would take much longer, and asking 33% isn't very different than mining with very expensive electricity, so why i should mine in your facility? i just keep mining with my expensive electricity
Thats because you know how to build a rig and mine yourself , they don't know and don't even have time to do , at first i charged 10% but it turned to be very low considering the effort i am doing , and they don't help in any sh*t , that why i pumped it to 33% and they just accepted it with no questions,because they don't do anything except taking 2/3rd of thier investments profits at the end i am better than a bank.