That breaks down to $610 per system and $30 a month for service. What type of hair system? For a custom hair system, that is probably an average "salon" price. If it is a sock hair system, that is probably double the expected cost.
Depending on the base, I think four systems per year is a bit, extreme. A well-made French lace system should last 4-6 months. Many guys on the forum report getting six months out of a similar hair system. I also question the need to back once a month for an entire year? You should be able to do the maintenance yourself after the first time, maybe the second. Depending on the style you choose, you could go from 2-6 weeks between haircuts. I guess if it includes the haircut, why not.
Verify the type of hair system before you commit. He is potentially making a pretty huge profit off the hair systems themselves. Home maintenance is pretty easy, and a lot of guys, depending on style, etc. do their own haircuts on their bio hair.
I do recommend starting with a salon, for the uninitiated, if you have someone who really knows their stuff, getting a well-made template and the right base, color, density, hairline, etc is worth the extra $$$. Also, being a newbie, and doing your own maintenance from point 0, can be quite frustrating.