It's a good question, and personally, I think this goes back to a mix of due diligence and seller confidence. (imo,) If you want to add an MMAO or a OBO to your items, it should be coupled with a starting price. "Having trouble landing on a good price, so lets say $xxx or MMAO". If you can't find a past sold price for reference, use the price check thread. If you don't get any results in a price check thread, while it may sound a little harsh, list it for what it's worth
to you. What did
you pay for it originally? Is it a popular brand name (Nintendo/Sega/Cave/ etc)? How old is it, and is it related to a popular title? We all wish our dirty socks sold for millions, but that's just not the case. Some of us also wish our boards went for 4x their actual value, but, that's also not the case. I don't think it's asking a lot for a seller to find a number they would be happy to receive if they did sell their item, even if they can't find a perfect past-sold reference.
Just from my own recent experience: I have/had a
VS dualsystem cabinet for sale, and had A LOT of trouble finding a past sold price. It's not a common cabinet to see restored, and I knew that going into it. It's also technically not the more "desired" version of the dualsystem; most go for the
red tent model if they want a DS. I saw that red tents were selling, while still needing A LOT of restoration work, for between 1200-1600. I decided that despite it not being the more desirable model, it's harder to find in the condition I've gotten mine to, and there isn't much of any work left to do on it at all; the restoration is "done", so I landed on a $2500 obo tag. Obviously it's just sat *here* for a little while, but I recently posted it to Klov and got A LOT more attention. Initially someone suggested that it may only be worth $1500 due to its size and desirability (understandable), but as it turns out, over there, I've had to beat people in DMs off with a stick for the cab. I probably could have priced it at $3.5K and it would have moved at that number. But I didn't change the price in the thread due to the attention, and I didn't start silent auctions in my DMs. I have a guy coming next week to pick it up for the exact number I asked for: $2500. I don't think I "Missed out" on an extra $1K. I found a number
I was happy with, and luckily, I got that number.