Battlegrounds are basically like instances where you join other players for a common objective. It is simply not fair that instances cost adventure coins, yet battlegrounds can be farmed endlessly without any cost, and they even reward skill xp points, meanwhile the only pve part of the game that rewards skill xp, as of now, is GV. My opinion is that they should cost coins too:
- CS should cost around 400 coins
- Shorehold should cost around 250 coins
- Gridiron 150 coins
- Skyring solo queue and team should cost 100 coins
- Kumas should cost 100 coins
The alternative: nerf the rewards.