I sold a few q9 insc Eternals 30k the other week, I would not sell my q9 15^50 o/s for that, much less a +5e. I would be asking at least double personally.
Agree with 25-30k. +5en isn't as useful for a Ranger as 15^50 and recurves are crappy for caster pulling bows, which is why it won't sell as high as a q9 15^50 (imo anyway).