Startup Idea : Personal (members only) internet sharing app

Why not to offer my fast mobile connection via wi-fi while in area with slow connection (GPRS, EDGE) of other mobile operator/or in roaming where charges are huge. USE CASE: After registration, user will be member of the private club. Members will be able to use mobile/Wi-Fi connection shared via wi-fi. USAGE: It can be usefull in e.g. rural areas where other operatorsa have slow internet connection (GPRS) or inside buildings, abroad etc. SECURITY: Mobile app will allow to use my connection only for registered users. Any reward system for sharring connection may by implemented. How do you like this mobile internet friendly app idea. Let me know here in discussion or via twitter @kotyzap