I'm not a huge online gamer but I do have several games which I regularly play online and in the near future this is likely to increase as I upgrade my PC equipment and buy another console.
I would not be prepared to pay an ISP extra just to guarantee lag free service because currently here in UK I feel ISPs are not offering the best service available in all areas, cities get much more choice of service and higher quality (speed typically) compared to more rural areas which are given less choice and pay a premium for a half baked service.
In the future I will get a router with QOS (Quality of Service) which will help to alleviate some problems but I am not likely to pay extra for a specific gaming service!!
Lag and ping issues are also related to the online service provided by Nintendo, Sony or Microsoft. If they don't have the infrastructure in place to cope with demand for online gaming paying an ISP extra will have no affect on their problems! As this generation of consoles sees all three offer online services/content for the for time (Xbox Live has a generation headstart remember) I expect their to be many teething problems that will need to be ironed out over time.







