Staviper here.

[Z3DLYSON]

Been a 100 years since i've played competitive wow.
Looking to start again.
What does donations get you here ?

[Thorbjorn]

Donating gives you coins with which you can buy different things depending on realm you play. Seeing as Lordaeron is hardcore you can buy mostly cosmetics and mounts. On Icecrown you can buy nearly everything - BiS gear, cosmetics, etc. Idk about the other realms.