I don't advertise gutter cleaning although I get asked randomly by joe public just say no blah blah
I advertise FSG and regularly get asked to clear gutters. I pass it straight on to another windy who's become a mate over the years. I still toy with the idea of a guttervac but I just see problems with getting it in and out of the van. The decent ones a fair size.
For the money that can be made it's worth getting it in and out of the van mate.
All depends what you can make on the glass, I cant get anywhere near the money I can cleaning windows and even if I could
it would need to be at least double to make me consider taking the job.
Get a tight gap between the roof tiles and the outside edge of the gutter and the vac isn't much help as the nozzle wont fit, so your always taking the chance that a ladder may be needed which is a no no for me.
I own a 4.8kw gutter vac and its a great machine but I wont be replacing it.