Most modern CPAP machines have built in analytics that will tell you for example the number of events per hour. Adjusting the pressure really isn't rocket science and I'd be damned to pay some technician moron to do it for me.
Damn...that's pretty unfair of you to say. I used to be senior VP at a national sleep medicine provider. We had a lot of excellent licensed Respiratory Therapists that spent there days helping people get adjusted to CPAP and making sure they had the right masks, nasal devices, pressure settings, machines and actually were using them. CPAP is meaningless without compliance (proper use) and RT's have a proven track record of increasing compliance, which means improving their patient's health.
Now for those that don't have insurance and finances is an issue, I would be the first to recommend that you get an auto-titrating machine off of Craigslist and fool around with it. It's a FAR better option than doing nothing.