Note that functionally those numbers (2500 1000 100 10) are pretty much the same as (250 100 10 1). If it matters to you. And also note it only subtracts from your gathering points on a successful gather. and not number of items, but number of successful gathers.

Dragonhead and Ironlake (and Treespeak/Halitali) are both G5 so there shouldn't be any difference at all in SP gain. only item pools.