I find it difficult (or puzzling) to figure out what's a good price / value for a chip sometimes, especially rarer chips that don't appear for sale too often.
Just musing about the following chip, which sold on ebay over the weekend (not my chip & I wasn't a bidder, just watching) --

Diamond Jim's Nevada Club - Las Vegas - 25c with inlay & HHL mold

My comment: A nice fractional from an older downtown Las Vegas club; with inlay rather than hot-stamp, as most chips have at this denomination.

TCR-13 (2011) rates this as an "X" chip at $600-$700 book value. C&W-4 (2008) rates this as a rare (R-9) chip at $300-$600, depending on condition.

The auction results: Sold to the high bidder at $330, with underbidder at $325. But no bids registered within the last 7 hours, when underbidder gave up at $325. This means that potential snipe bids or other last-minute bidders that might have been interested, but at less than the $330 level, were not registered. The 3rd-4th-5th level bidders were at $93, $86 and $75.

So what we have here is 2 bidders over $300, but hypothetically, if another one came up, and the winner wasn't interested in another one, the underbidder could "steal" it at 1 increment over the $93 third-place bidder. Most likely, another bidder(s) might join the competition next time, bidding it up beyond $100 for sure, and quite possibly into the $200-$300 range. As an R-9 chip, the next time one shows up, the bidders may be completely different.

My musing (besides having a few minutes to kill ) is to ponder at what level I would be a buyer, if I saw this chip, say, at the next convention. $300 or more? $200? $100? And what would a seller consider a "fair" offer and sufficient motivation to sell? With TCR and C&W as guides, would a seller accept less than $600? $500? $400? $300? In my view, determining a future "fair" price for this chip is pretty difficult.

As I say, just musing ....