I have developped many betfair apps, mainly for tennis, horses and soccer.
As long as your strategy is clear, I can garantee you that you will have a very stable solution.
the current bid is just a rough estimation. It really depends on the sports, markets and the complexity of the strategy.
I have many demos to supply you with.
Just drop me a line here if you want to discuss more the project.
I have many questions to ask, like:
1-Are there any other bookmakers involved.
2-Is it for pre games or inpay.
and many more...