Whydoes fisher have no native abilities that cost GP, and only one learned ability?

[Alhanelem]

Actually, it doesn't say that. Perhaps it's been changed since you last read it. When I read it a couple of days ago, it read "Increases shard yield" (period) Not even crystals or clusters. Just shards.

Try using a ward ability while fishing on fisher. The buff message is completely different from when you use it on miner/botanist.