Okay, as I said this will be a really rough estimate but in my heavy search phase - which was 1985 thru probably 2008 (2009-2012 I really scaled back) based on in-casino searching and the occasional bucket brought home, I easily looked thru a box worth a week. Some weeks a lot more, some weeks obviously far less or even none at all, depending on how busy I was. But that's pretty close.
Now I won't count 1985 since I moved here in Sept of that year, so let's say I started full force in 1986:
2,000 nickels/week x 52 weeks x 22 years = 2,288,000 nickels or $114,400.00
My last 50-D was found on 2/27/05, the one before that was on 6/16/99 but I don't have a record of the first. I suspect I was so wowed that I forgot to note the date.
Completed three sets from the wild, and only another 50-D is preventing me from completing a 4th.
I'm sad that my hunting has stopped almost entirely in the last several years. If there was a coin-op casino in my neighborhood I'd still be at it with the same intensity. Bank boxes just don't have the same allure for some reason.