I went in at entry level
I bought a Clarke 30 from guttervac systems about 18 months ago - they are less than £300 and have a 1600 watt motor. (They now do a 3kw) They came with a mirror to clip to the pole but we got a camera for about £90 which works and is cheaper than Clarkes £225.
I got a 2kw generator from aldi or lidle for £179 last time they were on offer and I was good to go.
It's cheap, cheerful and does the job - did a suck and clean on a medium sized 30's semi today for £160 (inc cleaning the outsides and soffits with wfp) which took 2 and a half hours for two of us. (DtM has to set up, clean and clear away all the gear on top)
I use it as a bonus for DtM and he got £70 and is happy as can be; I basically say to him that if he gets a job and does it himself as overtime he can have 50% after my costs so on the above job I took £20 for diesel and wear and tear and then split the job 50/50.
I wouldn't do it all day but it's a nice summer add on and a bonus for the lad.