What they don't tell you in witness school is that you are on call 24/7. Expected to fix any hardware or software errors immediately, have to be civilized and stoic and ultimately act as an ambassador for the network. Add whatever your specialization is such as coding, acting as rule enforcement or any of the other tasks witnesses here fill and it quickly becomes an 80+ hour a week job. Also until rank #37 or so most properly powered servers won't pay for themselves.

If you've got linux sysadmin knowledge, insight into how STEEM operates and the right interpersonal skills I say try a witness campaign.. But realize you're in fierce competition with some incredibly talented and versatile individuals. :)