I think it would be nice to be able to level up rank and other vip levels on the server by levelling up your normal level. For example, if you level up your normal level you will get some exp for levelling up your vip level. I get that this may affect profit on the server as people may not buy certain things because they can get more exp for their vip level for free but I feel as though this could make a profit on its own as people may be more intrigued to buy it as they can level up for free and get more items to fully utilise the perks and items the rank has to offer. :)