Different people have different motivations.
I'm 50 years old. I work for the US research division of a major international company. BS/MS in CS. 25+ years of experience.
For the past 1.5 years I've been working in the area of IP. Helping our engineers mine ideas, create strategies, and write disclosures. I also develop IP workflow processes and perform viability and clearance searches. I've taken classes from PRG and Landon.
Salary wise I'm in that 110-120 range. (depends on bonus).
I am NOT a registered patent agent, but it is in my plans to become one. I do not want to work for a law firm or even switch jobs. But hopefully I can continue to make contacts within the legal/IP industry and perhaps when I'm 60, I can take my pension, and my 401K and my savings and retire.
At that point I would like to do part time over flow work, preferably in the area of searches, as a supplement to my retirement income. If I don't do something like this, I'll probably have to work full time till I'm 67.5

So if I were to pick up 5-10 search/clearance jobs per month, at $250-$500 depending on complexity, I could create a nice supplement to my retirement income. best of all, as an avid RV'er, I could even perform this service while on the road. All you need is a internet connection an a subscription to micropatent and Nexus (or similar), plus google, freepatents, freshpatents and all the other endless list of resource sites.
No dreams of making $250K/yr as a independent agent. No misconceptions that patent agent = big bucks. But I do see it as one more item on my resume' (in case the bottom falls out of my current job) and as a path to early retirement.
W Vojak