I think the various Bicentennial chips are interesting & significant to collect. Only 2-3 are relatively cheap, and at the other end of the spectrum, the hardest 3 are VERY difficult (and expensive). Anyway, I noticed that 5 different Bicentennials appeared on Ebay recently, but only 1 sold (at its minimum bid). The chips were:
MGM $5 - unsold at $249 minimum. TCR says $400+
Sahara $5 - unsold at $225 minimum. TCR says $250+
Golden Gate $5 - unsold at $225. TCR says $250+
Union Plaza $5 - sold at $20. TCR says $25+
Holiday $5 - unsold at $43. TCR says $60+.

Please understand, I'm not being critical of anything about the auctions, nor am I doubting the validity of the TCR values. This is really too small a sample to find a trend. In fact, these chips may indeed sell in another venue (a chip show) or even next time on Ebay.

My musing is only that such "mid-level" chips (which I'll define as expensive for many collectors, but not the 4-digit "rare" prices) are sometimes illiquid to sell for fair value. It may take some work & some time to sell chips in this bracket unless they are "hot". Bicentennials are attractive, but they have been out long enough that they currently don't have "must have now" status. I'm not a coin or stamp collector, but my sense is that equivalent mid-level coins or stamps have a more liquid market when buying or selling, given the much larger universe of collectors and dealers in those fields. (Even so, not nearlly as liquid as conventional investments - stocks & bonds, etc.)

Actually, the only conclusion I've drawn is that it's tricky to buy mid-level chips with the expectation of reselling them in a reasonable period, for a decent profit, unless you can get a pretty good deal on them. It's less of an issue for a collector who intends to keep the chip in his/her collection, without the primary interest of turning a quick profit.

Does any of this make sense? Anyway, that's my musing for the night. Off to bed now.