You can only use those 10 K arrows.
I read in another post that a long, long time ago, premium items were tradable in game. Player bought the 10K arrow stacks, then sold 1 arrow for MILLIONS of gold, because you could then create a 10K arrow stack with normal arrows.
JM lost real money and the game economy went to crap, so they placed special conditions on the premium items.
I bought 3 stacks thinking I could hold 1 in inventory, 1 equiped, and one on my squirrel... keeping all 3 stacks maxed with pickups. But they do NOT stack, so now I have 20K extra bolts, plus another 5K or so equiped.
