those stores don't keep that kind of data. what would be worth looking into is how DL tourney's translate into bigger lunch rushes for the food places around them. I know Thundercloud gets a fair number of people on a tourney day. Or even on Thrusday night when people leave to get food and then come back.
From a business stand point, us gamers can be pretty fickle as sources of income. Sure we make purchases there (hopefully), and they can be big ticket items, but we also take up a lot of floor space and (of course) parking. and we stick around for hours at a time so that only compounds the parking issues.
if those other stores were smart they would have had signs that said "30 minute or less parking" but i don't think there is a way for them to enforce or check that.
I'm looking forward to a new DL location. I wish them much better luck with the parking and the neighbors.