Brilliant concept, loving it so far.
Only thing ive noticed is sometimes items are greyed out in the shop even if i have the gold to buy them, currently have 2 items at 1K and 2 items at 3K in the shop and 6K gold, but one of the 1k items is greyed out?
EDIT - i bought a pack in the meantime and as the prices changed the one that was greyed out shot up in price...did think it was odd as it was a purple so think the pricing on it was just not showing the true amount :)
EDIT2 - Currently 1 pack will cost me 3K, but for 5 packs it says 2K and then 10 packs 56K, yet ive just ticked over 20K gold and can now but the 5 packs. Doesnt make sense that 10 packs would be more than double the price of buying 5 though?