Honestly, if you asked me, it should be done that way where its just a set rotation each month because there's no reason to run a vote by people who already have the content for people who don't have the content. Especially when this concept can easily be done by the staff members themselves just using a random number generator or even picking an order and cycling through the characters each month. Having people vote for something literally affects them in no way shape or form what so ever is a dumb waste of time. Crowchild isn't magically animating 300% better for the gold membership payers, hes still doing the same thing for them as is available with the free members. Its the exact same as a free membership except with more characters.
On top of that, everyone outside of gold membership already knows what to expect with gold membership. The release of premium content temporarily each month has nothing to do with the gold members, they get nothing out of voting for it. You do realize that the vote has literally nothing to do with them, correct? There is no correlation between the paying members and this vote for temporary free release, they get nothing out of it and 'what character will most likely bring in paying subscriptions?' is purely subjective.