I would quite gladly put some money towards the developers costs and beer money, if only the gems were not quite so expensive or the items you can buy with those gems.
At present, I believe that the cost of the gems, compared to the prices of the things you can buy with those gems are 5 to 6 times more expensive than people would like.
In short, you are not looking at a few rich kids that should be paying your wages, but at the more average person, who cannot afford such luxuries and with the current prices, may enjoy the game, but will not wish to pay money in to support it.
I advice a price tethink please
Chappy