iPhone back glass laser machines?

I’ve been considering buying an iPhone back glass laser machine, but I’m having a hard time justifying the cost when I don’t have many customers asking for back glass repair. I’ve made mistakes in the past where I’ve splurged on machinery that rarely got use because I thought that by offering a service, people would come- only for Apple to flip the script and change designs. However, I’d wager that Apple will continue the back glass design rather than switch wood or something simply for the fact that it’s profitable to have an external indicator that your device has been abused.

Q 1. The machines I’ve seen in the market say they work with iPhone 8- iPhone 13, so my train of thought is this: If I spend $1,500 on one of these machines, it will take two years to pay for itself. Can laser machines be updated to service the iPhone 14, 15 and beyond?

Q 2. Are there other uses for these laser machines? If I could fix more than just iPhone back glass that would really seal the deal.

Q 3. Which laser machine to buy? There’s so many different models available, that shopping for one is exhausting. I’ve seen bare-bones machines for around $1200 which requires a laptop to run it, and I’ve seen other fancy models with touchscreens from $1,500-$2,000. For those of you that own laser machines, are there particular models that you like? That you would avoid?