OK. How much it would cost ME to hire YOU to format drive, install W8 and its 96 updates, then update W8 to W 8.1 and last not least install and configure some 20 software apps.
That's how much this is worth.
I did it on my own time, but not for my own pleasure. I did it because of the buggy 8.1 update that can not install itself.
If it costs you “at least $400” to do your own chores and puttering, then by all means hire people to do everything else in your life.
Personally, I separate my own chores and puttering from what I charge customers when I am working.