Why do so many sellers take offense to offers on their listings?

I don’t get offended by any offers, instead I respond by stating the lowest price acceptable to me. I am usually in no hurry to sell so i don’t get discouraged by not getting any digs on my sale items, sometimes for months.

This is a great thread. I'm considering making an offer on a pair of speakers. It's good to know how people think.

When I sell a used item, I mark the price as FIRM. My prices are almost always lower than others being currently offered. When somebody lowballs after that, I find it very annoying. It’s hard not to be rude to the low-ballers given those facts.

@secretguy 

I would insist on freight shipping if you are dealing with floor standing speakers with cardboard packaging. Unless they are in wooden crates, they are unlikely to survive FedEx / UPS delivery. 

I've been shocked a bunch of times, at the low price an item I was watching, sold for (relative to asking price). Would have bought it if I knew how low price would go. I'm never offended by low offers, except the few that then argue why I should accept their low offer. Most of us here are not professional sellers.