I believe there ought to be more items there and that we must simply have to do that tide kill or once queen once in order to get that item. That manner if uve completed it once it wont be a requirement. This way u wont have to be overhaul wave lvl 7 to high gamble or kill queen to buy a granite body.
One new reward or fresh grab, would be upgrading your armor, such as the way u can upgrade your function, that would bring alot more ppl into playing barb assult. (I mean armor only purchaseable from the points not the granite) There might also be a bonus for having lvl 5 equipment...
Another idea would also be obtaining more granite things from barbarian assult i.e possibly granite maul 25k and kill queen, along with purhcaseable by points 200 in every role, there might also be the granite sword in there, 50 attk 60 str or even 50 whichever is greater.1 handed
Another thing would be not 500 being the max but 1000 or more on your points. That would be practical for gambling and maybe have super high gambling (1000) points which would increase the prospect of getting a much better thing, and the rare desired dragon chainmail.