Years ago I wanted to purchase a LA machine and start a business. Unfortunately, I didn't have the space at the time to house the machine. So, instead I started a decorative concrete business, where at least the tools of the trade can be stored outside. And one HUGE thing I've learned is that no matter how closely you try to figure expenses, they will always be much larger than anticipated. Once you purchase the expensive equipment, will others be willing to pay to keep you working to capacity? And after expenses, how much do you really make an hour? And now that you're self-employed, you're probably no longer contributing to social security, you may not be able to afford health insurance, etc. etc.
I love what we do with concrete, and I still hope one day to be able to purchase a LA machine. However, I have no illusions whatsoever about being able to make money with it!