I use to be in the enterprise "consulting" gig. As a consultant its terrible. The only rate you know is what you are making, and thats just at the per year level. As the consultant you never know what is being changed to the client and so you never know your actual worth. Rates are probably the closest guarded secret for consulting firms. Plus you are a profit center to the consulting company but a cost center to the client. So there is the horrible pull between your management to "maximize the billable hour" and the client wanting to keep costs on the project down. Oh, and god forbid you are on a flat rate project where the only limit is time. Be prepared to work 80hrs and have no life.

I've seen two reasons why mega insurance company inc brings in "consultants." One is the consultant is specialized in an area of tech that is completely outside of the companies expertise. I did some of this being in a niche area of enterprise security. While those contracts still suck they suck a little less because you are at least advising the company and getting them up to speed on something. The other type, and the most common type is the "staff augmentation". I've been on those projects too and its exactly how they seem. The company has some in house knowledge (say a manager of infrastructure and maybe one full time employee for that tech) but the rest is really about throwing bodies at a project. From the client's perspective its all about workforce flexibility and not having the expense of a full time employee on the books. Even at like 100/hr its cheaper I guess for them vs having a full time employee. Plus its not their "core business" although in 2016 I'd argue if you are running a company it's insane not to think of tech as part of your "core business."

Overall, between the unsteady work, travel, etc being an enterprise consultant sucks. Most people that I know go into it because the potential to make a bit more money vs a traditional job at mega insurance company inc is there and they don't like the idea of working for mega insurance company inc for years. However, I've been on contracts where the project is like two years long so you might as well be working for mega insurance company inc anyway.