I've got the skyvac atom and i've never really had a problem.
I just do basic, simple domestic stuff (for my existing customers).
With the right technique, and the right tool, you'd be surprised what it can clear.
It's a learning curve, like everything else.
I just offer...'gutter clearing'...that's it.
I have cleared the odd down pipe, but they are usually fairly straightforward to do and you can just add a bit on at the end for your trouble. In general a good little earner.