Personally I think $50 is a little too low. Its a .org so it not gonna make you rich but its a pretty good industry . I would stand firm . I would say $300 is extremly fair. If it was me I would sell this name for less than $100. Maybe counter with $250 and negotiate and hope to land at $175. also alot depends on how much reg fees you paid already. if say its 2 years reg fee than that already $15 gone and your profit is only $35 . Not saying that not good ( thats pretty great on a $15 investment) but take that into consideration.