you must get all easy access jobs then not having the need to use guttervac poles?
Never had a problem with the work I have taken on, but to be fair they're not exactly our main core of business. I have declined the odd job, not totally due to access, though it has been a partial factor,
I wouldn't generally go above two storey work for gutters but if regular client insisted on it then would consider. Anything above I'd either consider cherry picker or if unsuitable or too expensive for domestic then I'd have to consider other options, which may well include adapting one of our WFP's to take the vac hose, or even subbing to some one with poles.
If all of a sudden we were having gutter cleaning requested all the time then I'd consider purchasing poles, but as per my previous, I think ladders will in most cases be a definite requirement.
Incidentally, there are better ladder safety devices out there in terms of practicality and speed of use. That kit you linked looks great, but I would imagine it becomes a bit cumbersome for all day use on most sites, which are rarely surrounded by pathways or the like.