GOGO inflight Limit on number of devices in a month Internet

I have een a loyal Gogo customer for as long as they have offered Internet. My fees have gone up anod I have not complained. In Jan 2015 they put in place a monthly limit on the number of devices you can connect .... I own 9 devices any of which could be on my flight. As a result I am hitting that upper end of usability. I can understand one at a time. But a limit?????? This is not disclosed in teems of service nor in FAQ (in facet the FAQ contradict this). Come on Gogo. Quite treating your long term customers like thieves.