I don't get an inside view of how X10Hosting looks under the hood, but I'd venture to guess that since paid membership does not require you to have a forum account, that the forums and your X10Hosting client account are not linked in any way. This means that an entirely new system would have to be created so it's going to be a long time in the making, if it's implemented at all.
Non-automatically, if you could request somewhere to have yourself added to a "premium" user group, that would be easier to implement. However, only staff members can see your client information and not all staff members have even an account on these forums, so you run into more trouble there waiting for a staff member with permission to come along and see your ticket. With a non-automatic system as well, when someone stops paying for premium, they will still remain in the same group as the paying members, which would probably make people angry. So this solution is non-optimal as well.
I think one solution is to make the premium user group a group that anyone can join from the UserCP. It couldn't really come with any perks other than the predetermined title change (probably "X10 Premium User" or something like that) and access to a premium forum, otherwise everyone would join that group for the perks.
It's just a tiny little thing, but there is a lot of trouble it causes. I wouldn't rule it out though; X10Hosting takes very good care of it'smembers, and especially it's paid members, which I can say as a paid member
