Excellent question. There are others doing this now, and there is a definite uptick in singles prices, on average, over the last couple years. Additionaly, by nature the first chips you get are going to have a lot of cheaper, lower-hanging fruit to pick. I'm still missing a ton of common <$10 chips, but CONDITION is a real bugger for some of them, which is why I don't have them yet. Recent aquisitions have also not included large amounts of cheaper chips, like duplicate $1s, that were more common in earlier purchases.
Old data from the OP, Feb 2022:
Transactions: 90
Chips: 796
Unique chips: 421
Average cost per chip: $6.122
Average mass of a chip: 10.430 grams
New data, May 2023:
Transactions: 211
Chips: 996
Unique chips: 588
Average cost per chip: $6.962
Average mass of a chip: 10.226 grams
My last 200 chips it seems, raised the per chip price of my first 800 by 14% or so. Meaning my average per chip price I'm paying now is up +65% or so from the first 800 chips I got. Burro Inn was a $35 chip if I recall. That does not help my $$ average at all!