Why would you advertise that? Do people care all that much? In the end they can buy things cheaper than retail thats all that matters who cares how much the service is making since you get what you want.
Its just how business works. If google advertised how much they make off of you for every search and click would you keep using them or move to one that seems like they are working for free whrn they arent?
I wouldnt advertise that Sidhujag, but I also would not run a business that required hiding anything from my customers. I would simply run an honest auction with clearly shown end and start dates and run a 3 month Beta test with paid customers before I launch...but thats just me.
Google very publicly post their profits Sidhujag, and if anyone wanted to find out where it all came from, that wouldn't be hard to do as they are a listed company. You on the other hand are one guy on the other side of the world...you have a lot more to prove about what you can deliver for my money than Google do.