What kind of job is that? Dust the fan of the SP20 every week? I guess I should say "fans" because at the current difficulty and exchange rate you'd need 4 x SP20s to make $200 a week.
I have about 40TH/s and for me mining is a hobby that has gone a bit out of control, but one set up I don't have to touch my miners. It is not really a job until you get up to the petahash range.
10TH here - pretty much full agreement. I make about $50/day, or ~3.7BTC in the next month - minus almost $800 in electrical bills ($0.15/kwh), so not very much profit after paying all upfront costs. At this point $1500 in electrical work, and $1200+ in networking gear, PDUs (213V), and power supplies since starting small a year ago.
if you have cheap power where you live (ie: $0.10/kwh or less, it could be worth looking into as an investment. But outside of 5-10hrs of buying, receiving, setting up, and getting it working right, there's not much more work to be done - maybe a few minutes here and there to tweak cooling or reboot - its not a job. Even with 10TH spread across 12+ machines of different brands and styles I only put in 15-30min a week tuning overclock settings or rebooting a troublesome Bitfury unit