If you won't make Horse speed, stamina and carry account bound, then would you consider adding a crown store option to buy 60 at once. Right now you can buy them for 1000 crowns and get 10 speed, stamina and carry for your horse. You can use gems and buy them one at a time. Well I think an option to max out speed, stamina and carry on your horse in a single purchase would be nice as well.