as pink helmets says, 10 is not really the maximum
just after a certain providor issued a new card, as a proof of concept sort of thing, i thought id see how far it could be pushed
using an enigma1 based receiver i set everything up, and along with a few friends and relatives, very quickly had 20 connections running, flawlessly
phoned a few more people, 30, all with no problems
yes, everyone was on a different encrypted channel from the same providor
a few more emails and 35 connections were active
eventually got to 40 active simultaneous connections, then the premium channels started to suffer minor glitching, but the 'lesser' channels were still fine
this was with 40 connections, all watching a different channel (about 25-30 were premium channels) from the same providor at the same time
as long as you configure things properly, you should be fine m8