I find this interesting, and after hearing about Twilio, it is on my list to play around with also, but for a slightly different purpose. One of my amusement machines is set up to send me text messages with meter readings. I would like to have that data sent and massaged into a more usable format for long term trends. My other use case was for running prize competitions to engage customers more for repeat business on my amusement (e.g. running a high score competition on arcade or pinball machines).
As others have said, operators generally are not run off their feet with service calls, and I find most people are more likely to walk away from a machine than report malfunctions and location owners are too busy running their business. I often get to a location to be told it hasn't worked for days/weeks/months.