Hi!
sorry but – i dont like your idea …
To pick some examples, and I am not saying that these are the correct costs, but suppose the game assigned a cost of A$100 to a gender change, and A$50 to a name change. So a person could do these actions if they really wanted to and they had the money in their account. But obviously no one would be able to shift genders 10x per night every night, because they would run out of money very fast.
its easy to create a new account
Another issue is that many people especially women dislike “cold invites” and use various means to discourage this behavior. And I sympathize with their feelings.
there is a very usefull ignore button in the game
Certainly there are problems with this whole scheme. The main one being free members start with A$0 in their accounts. Well, they would have to make some friends to invite them, or friends who would gift them A$
A$ for closing friendship or a gift from friends ….. you will have MANY MANY more gender changer in the game
or else even free members could get a small monthly “allowance” of A$25 or whatever
good idea! i like it – but 25$ per moth for premium too then 
anyway … the basic point of achat is to have fun – think about