Same here ($65 -> $75); I think it's an "equipment fee." I don't even use the router. My employer covers the cost so I haven't called to complain, but I suspect if you do you can return the router and lose the fee.
I keep the router they gave me in one of my garages. The only time I've ever connected it was when their service had a problem and they wanted to run remote diagnostics. The other 99.9999% of the time, I use an OpenWRT VM.
I would not have accepted the router if there were any strings attached, and they're welcome to take it back if they want to start charging me for it.
