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Each dot on the graph is a collection. It shows the daily average per game over the course of the collection period.
In the beginning it was 9 games. In late May of 2016 it went to 11. Went back to 10 at some point. Then I bumped it from 10 games to 12 games on May 24th, 2017. There are probably other instances here and there where it was a game or two short if something was being fixed.
I've been running leagues that entire time. They are 8-10 weeks, with a 2 or 3 week break in between. I think the current one is "season" 14. I've also been running monthly tournaments the entire time.
Big spikes in 2016 are because of selfie leagues. I should do those again sometime. (Even though only 10 people played in each, earnings went up 20-30%. Selfie league rules changed and I also didn't want to just be milking those same 10 players all the time). Collections are every two weeks on a Wednesday, but the really low ones are anomalies where maybe the collection date was shifted so it didn't include the normal even distribution of days of the week.
So, squeezing a few more games in has probably made a little more money overall, but the daily average per game hasn't changed much at all over time. My leagues have been getting a little smaller. There are a lot of other great venues that keep popping up, so while the demand is going up, so is the supply.
I usually crop it out when I show a graph, but I included it above. These games earn 3-4x what my games at my other two public locations earn. So the main reason I usually leave it off is that this is my best location, by far...and I don't want to set unrealistic expectations. Also, this shows the money in the coinbox, and doesn't reflect my take home after the split with the venue. (Or money spent on parts. Or time spent doing repairs, running leagues, etc. Yes, there is money, but you have to love pinball to do this. And, my bank account is continuously empty because I've been (mostly) very slowly expanding, and need to keep buying new games).
This location is the only barcade in town, has 25 video games (not mine) and 12 pins (mine). It's a crazy dance floor on weekend nights, pulling in almost 1000 people over the course of a busy Saturday. Most of those people are not there for the games. Anyone who finds their way through the dance floor to the pinball room in the back will only play a game or two. On a Wednesday night, when league starts, there can be 15 people playing pinball and like 5 other people in the entire bar. So, it's all over the place. The bar is on the main drag downtown. Lots of foot traffic. But it's in a basement and many people don't know it's there.
There isn't much other competition in the city of Boulder (three places have around 5 games, but are weird venues)...but, all of the surrounding cities have great places. There are roughly 15 spots with 10+ games within an hour of Denver.