You're putting a bunch of parameters to frame your viewpoint favorably. First, OP is not a business. Second, you still refuse to recognize the fact that the buyer didn't want to keep his word. Keeping his word means not trying to get the seller to agree to $550 before inspection.
A couple of points.
1. When you conduct business (i.e buy/sell) as an individual, you are expected to adhere to the same rules and conventions that govern commercial transactions. Most of the laws that govern formal business transactions apply equally to private or personal business transactiond.
tl:dr - you do business, you’re a business.
2. The buyer
did keep his word. Or attempted to. He reaffirmed he’d pay the $600 after the seller took a snit fit. And was ready to do so until the seller told him decided he no longer wanted to sell it to him.
3. I’m not trying to paint my viewpoint favorably. Why would I? It’s just my personal viewpoint. I’m good with it for the reasons I’ve already given. If someone thinks it’s incorrect that’s perfectly fine too. I offered it as something to think about and talk about. It’s an opinion. Not something to be taken as gospel truth.
Now, after inspection and asking for a justified $50 discount is fine. I'm thinking this is the basis for your viewpoint.
Nope. Any dollar amount is totally irrelevant AFAIC. What is relevant is that somebody called off a business transaction for reasons of personal pique.
Apparently the amount of money didn’t matter to the seller either. He lost his cool over something trivial and easily ignored and backed out of the deal.
Clearly, you fight for your viewpoint here in TB. So, I'm likely to believe that you use this negotiation tactic as a buyer.
Ignoring the minor
ad hominem attack in the above, the best I can say in response is that you’re welcome to believe that if you like. But you’d be wrong. I never haggle prices.
The most I’ll ever (very rarely) do is make a single counteroffer on an asking price for something I desperately want, which I make clear is not a opening bid. I’ve got a very precise number I know I can responsibly afford for anything I decide I want to buy. And I’m very open with the seller about how my counteroffer is my only offer - with no hard feelings either way. If he/she is interested, we’re done. Your Paypal please? If not, that’s fine too. Thank you for your time.
There’s lots of cool gear I like but can’t afford. I’m not offended if somebody wants more for something than I can spend. It’s happened before and it’ll happen again.
FWIW, about 99% of the time I just pay the asking price with zero discussion. There’s even been a few times when (completely on my own initiative) I’ve paid above the asking price on something I felt was an unfair deal for the seller. I’ve done that a few times with some of the sellers here.
Keeping one's word means not asking for a lower price later without inspecting the item. That's my book, and how I approach CL deals as a buyer.
Keeping one’s word means paying the monies you agreed to pay for the thing you’re receiving - like the buyer tried to do.
Keeping one’s word means delivering the item promised in exchange for receiving the monies agreed to - which the seller refused to allow take place.
Everything else outside of that is superfluous from a business perspective.
Offer.
Tender.
Acceptance.
That’s how business (even personal business) is supposed to be conducted. No ego. No drama over words. Just money exchanged for value received.