So far, I've not seen anyone compare anything other than citing their 'dev friends'. Although to be taken with a pinch of salt, at least there are some numbers here to compare.
I am not sure what you mean by the final statement, I'm just someone stating their opinion like everyone else.
Probably the best thing to do here would be a business plan. Or a roadmap, or something where goals are laid out and a budget is set, based on real world quotations.
This sort of stuff should be in the original proposal document. It's early days and I suspect proposals will have to be spot on in future.