A million years ago, in 1997, when I was at WSEX I caame up with the idea of paying monthly interest on accounts, that was paid monthly. It used quite a fancy formula and made sure to even include open wagers.
I think it was about 3% per year, which was about what we were receving in our offshore checking accounts.
They still paid that for years even after the rates dropped below 3%. They finally stopped because it served no purpose, and the rates got too low to pay anything worthwhile.
The original purpose of the interest was to get people to stop sending money in and out every week. It never worked.
Coming from a securities background the whole thing never made sense to me, I thought with the interest component, people would finally treat their sportsbook accounts like their brokerage accounts. I was wrong.
If you have $2,000, $20,000, $200,000, or $2,000,000 at Merrill Lynch, do you constantly take money out every time a stock makes money? For the most part no. You leave it in there for future trading. Maybe 4 times a year, or twice a year, or once a year you adjust your balance. I couldn't imagine how busy the brokerage houses would be if everytime people made money on a few stocks in a week, more than not requested a payout.