giving you the benefit of the doubt here and assuming you're just bad at math, as opposed to
spamming/trolling. let's break this down for you:
a feather is worth 3 gp. source:
https://www.ge-tracker.com/item/featherthe d2jsp osrs gold ratio currently seems to be around ~1:27 - 1:31, but let's use 1:30 in this example.
this means: 1M gp (1.000.000 osrs gold) : 30 fg
which means: 33.333,33 gp : 1 fg
which means: 1 fg will get you 33.333,33 gp, at the ratio of 1:30
you are asking for 1 fg (value: 33.333,33 gp) per 1 feather (value: 3 gp). your entire stack of 10k feathers (value: 30.000 gp) isn't worth 1 fg (value: 33.333,33 gp).