I agree, and that's why, although you maybe thought somewhat outrageous, if OP is going down the 1-time path, i'd rather pay a lot in hope that they can keep th

I agree, and that's why, although you maybe thought somewhat outrageous, if OP is going down the 1-time path, i'd rather pay a lot in hope that they can keep the cloud services running for years even if they decided to stop working on it. I like your formula approach.