I'm really sorry to hear that. I'm a dual mace combat spec Rogue and I love fiery weapon. I have it on both maces and it procs constantly.
You're price is right. First time i got it, I paid 55g each weapon. But lately I've seen it for 25-40g on feathermoon.
I think some people confuse fiery weapon w/ Demonslayer and think enchanters are trying to rip people off. Maybe try explaining what it actually does it your trade post.
Good luck!