Attributes are only used for very specific nodes, that if you meet the requirement you get bonus to the gathering. Therefore there is no point in increasing said attributes more than what is required by the node (which most of the time should be very close to your level anyway).
GP on the other hand, is effective but only if you have enough GP after certain threshold to use this and that ability combine, as the GP gain rate is static. So if you have 700 GP you could use a 400 GP ability along with a 300 GP ability for example, and there's little point to have 699 GP in that case.
Gathering and Perception is quite important, the unspoiled gathering nodes has massive Perception requirement to yield HQ material, and also high gathering to get 100%.