It is a pain in the ass to support the customers equipment.
If it's such a pain in the ass to support customer equipment, then supply the required modem free of charge instead of turning it into a revenue stream, "just because you can".
OMG! You FN Brilliant bro That is what I did at the local Charter office. I got the newest surfboard 2.0. If anything goes wrong with it in a year they swap it out. Just a money grab... -- I got the need for speed »bit.ly/topgunparody