It does not matter how much you rant, the T & Cs state you must use the router supplied. Sky will be quite within their rights to cease your service for breaking them, if they so wish. The Sky service is sold specifically for domestic use and the routers the supply meet this need. If you need a business class router, maybe you should have gone to an ISP who caters for business needs.
I also disagree with Sky's router policy but see no point in ranting about it.
