A couple of points and observations.
1. Many ads don't have enough validation of the true value, and many buyers don't know true value either. The OP didn't offer $200 for an ivory Southwest.
2. There are newer cue makers (I won't mention names), that start building cues and put ridiculous values to them. ie, this is a $2500 cue and I am a master cue maker, but I'm selling it for $900. But the guy who bought it repeats the $2500 cue value from the cue maker and wants to sell it for $2k.
3. The true value of anything is what it most recently sold for. My step son bought a Jimi Hendrix album on eBay for $15 and tried to explain to me that it was worth $150. He didn't comprehend when I told him it was worth $15 because that's what he paid for it. If he resells it for $150, THEN it's worth $150. Guess what, it's still in his room.
There are TONS of cue makers out there nowadays. I'm sure most have huge egos and believe they are making the best cues. But until you have a reputation (ie SW, Searing, Gina,etc) it's worth the materials put in and a nominal expectation of time invested in the cue. That does not count time waiting for it to cure, etc.