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

[Alhanelem]

technically speaking, the detection abilties are not without use, you can set them on any class to find gathering nodes without specifically being on a gathering class- so you can be doing random stuff on a combat class and go "oh, there's some mining nodes" and switch to miner.

It just scratches my head why fisher has GP at all if 1) it has no abilities that cost GP and 2) the only cross class abilities which cost gp have no effect.
The only value I can see in it is your GP won't be lost if you switch from one gatherer to another.

Since they increase yield on gathering shards/crystals/clusters and you can't fish those up (1.x had ALC recipes for turning fish into shards and crystals, so FSH could gather them that way, putting them on an even level with Miners and Botanists, but that's gone now, and still wouldn't apply in this case), it's difficult to see how they could possibly do anything.

I guess it's worth noting that the tooltip for the buff doesn't even say anything about shards/crystals and just says yield is increased under thunder affinity or something like that. Do any fish have elements associated with them?