I think the phenomena of seeing 1 per day can be explained by how people collect these. There are two camps of people when it comes to bicentennial quarters--actual collectors and hoarders. Actual collectors have maybe one or two in BU condition, maybe plus the proofs and 40% silver releases. Hoarders most likely have $10-200+ worth, and tend to dump them all at once when times get tough or they realize they can't bring them to a coin show and retire. Thus, the supply is in a constant state of flux as people hoard, dump, and repeat.
I was a cashier from 2008-2011, and I saw a similar pattern--the tills would become flooded with 1-5 coins per day for about a month, and then it would slow down to a trickle or even dry up for months at a time until someone made another dump. I used to put them in the "miscellaneous" slot in my till and hand them out as change to people with small children or grandmother-type customers. Always nice to brighten somebody's day a little.
I was a cashier from 2008-2011, and I saw a similar pattern--the tills would become flooded with 1-5 coins per day for about a month, and then it would slow down to a trickle or even dry up for months at a time until someone made another dump. I used to put them in the "miscellaneous" slot in my till and hand them out as change to people with small children or grandmother-type customers. Always nice to brighten somebody's day a little.






















