i dont think you can solely survive on gutter cleaning alone, ive had all gear you can mention, like you i thought all overflowing gutters will want cleaning out, not all want to give you money, i have websites, free adds on internet like yell.com etc, if i didnt have my window cleaning customers as my main custom things would be different, fortunatelly it paid for itself around £900 of gear, it went very quiet, so i sold up and made a proffit, i just use tripple alliminium ladders with a good stand off using a harris pole with atachment on from pound shop, quicker and easier than gutter vac setup. if its too high i walk way