There are rules and regs to follow as well as fee schedules.
https://www.cmegroup.com/company/membership.html
You'll probably want to compare what kind of markets you're in to the seat price. You'll get better execution and rates with a seat but the cost is what's important. You may be able to go with IB or a futures specific broker and get similar execution and rates without having to own a seat and abide by a new set of rules and regs.
To your point I find it hard to believe someone capable of generating 60k commissions profitably wouldn't be attracting the kind of attention that would make even asking the questions you are pointless. Assuming you're legit, you'll want to call the CME, IB, and a few others. You can probably even find a place to fund you further. You can go basically anywhere else and get better execution control and rates.
Pinging
@bone - he probably knows people.