It sounds like you have a solid grip on the direction of development. I'm seriously considering using igLoader technolgy to compete with the major online browser based tournament providers (although this was not the original intent for TournamentBlitz.com I would like to make it an optional capability).
I'm working with one of those guys currently to integrate igLoader into their existing tech. The SDK is open and written for a variety of Programming/Scripting Languages and Platforms (Ie: Torque Game Engine, Python, C++, Blitz3D, others). Any game with basic telnet/http and scoring capabilities can be turned into a Cash Tournament Game. Any Application with basic telnet/http can be turned Paid Rental.
Sounds like my SDK, which is really a comms layer to igLoader, and your backend stuff could fit quite well. The great thing about eXigo is your application/game does not need to have any http/telnet capabilities - eXigo and igLoader handle all comms in a secure manner. To encourage the use of SDK's all are provided free of charge to Developers. Developers are also offered a very liberal licensing agreement in which the retain full rights and also earn profits from tournaments, coinop, advertisments, and in-game transactions. This distribution model may hender my adoptation for igLoader due to licensing contraints.
Each and every customer has different licensing requirements, as such we tend to craft an agreement according to needs. For example, in this instance it would make sense to approach this as an OEM deal. igLoader would effectively be part of your solution and you should only be required to license when you transact revenues from that solution. Anyway, talk to me if you want to persue this.Tim.