Tech limits? Lol, I'm not that good at programming yet, but they could easily make a script in which has a 33% chance on an HK to get a Bloody Coin.
Also, remove coins and/or items from those who exploited to get them.
They wont, the whole system sucks to begin with. If you are flailing around alone you have to be extremly careful in luring out single players especially if you are wearing PvP gear. Some classes have a way easier time with this such as rogue. A friend of mine made nearly 300 coins legit with no big problem whatsoever as rogue while my elemental shaman is at 90 now.
- Giving coins to group members similar to how looting corpses is made in turns isn't hard, Zarhym is lying.
- Healer not getting anything is a nasty oversight on their part.
- Some characters don't even reward coins. Don't bother killing DKs because if they've skilled purgatory and it's not on cool down you wont get a coin either because it's not you but purgatory that lands the killing blow. (Not sure if this applies to holy priests aswell.)
- That thing you can buy for 50 coins to let you transform into a Yaungol in BGs and the likes? DON'T GET IT. I made 12 kills under it's influence on a battleground. I didn't get a single bloody coin. (No I didn't die, yes the buff was active, no it didn't reward anything.)
The best thing ist that some people exploited the hell out of this farming thousands of coins without any effort. Thanks Blizz for not testing this whole thing at all.