£15 for 10 minutes cleaning 3 windows? AIBU for thinking this is a rip-off?

[HeadAndShouldersPerson]

We live in London, typical suburb, and my wife signed us up for this window cleaning service whereby they come by every 6 weeks or so and cleans the front windows.
I'm usually at work but was in today as I'm WFH.
He spent 10 minutes cleaning the ground floor bay window, the first floor bay window and another small first floor window.
AIBU to think that I'd be better off buying something like this window cleaning pole and doing it myself and saving a few quid?

I'm in the Home Counties and pay £12.50 for all windows back and front. It's a 4 bedroom house so quite a few windows

By back and front I mean of house not inside and outside

It's always going to be cheaper to do it yourself.

Mind you, the going rate here is about a fiver a fortnight for 4 front windows and any glass in the front door.

It does only take them 10 minutes but I suppose that's because they come every 2 weeks.

By back and front I mean of house not inside and outside

Wow! We have 11 large windows and pay £20.

Yorkshire. £7 for 8 windows once a month. Collects his money twice a year!

Not a rip off. He offered a service, at a price and a contract was made.

You would be better off doing it yourself - so long as you make a commitments and do it at least as often as once every 6 weeks, no matter what the temperature, weather or whatever else you have on.

If that is what you’d like to do, then why not?

I pay someone to cut my grass. Takes him 10-15 mins, costs me £12. I have an elderly lawnmower, and I could do it myself for try e cost of the electricity. I just can’t be bothered. Or to drag it out of the shed, or to take the clippings to the tip. I don’t need the money for something critical like food or electricity, so I’m happy to pay it. If you are not happy to pay your window cleaner, then DIY, or have dirty windows.

I'm in Manchester and pay £6.00 for a 4 bedroom house with 2 patios and many windows.

Depends on whether you would actually do it. I pay 16 quid for a 4 bed house, front and back, monthly.
I would never bother to do it myself

Surely the cleaner quoted you a price before you agreed to him carrying out the work? What is the surprise? The amount if time it took him to clean 3 windows?
If it's easy to do I would do it myself. If it involved cleaning top windows that required me to shin up a ladder I would pay someone else to do it.

£13 for 13 windows here.

15 here in Scotland for 7 windows, 2 doors and a massive conservatory that is glazed to ground i.e no dwarf wall.

£10 here in East Anglia, that's for 6 windows, front door and double patio doors (just outsides)
I used to pay £6 but that was with the pole system, new one does it all by hand properly.

£25 here in the SE for 17 windows and doors. We only get it done twice a year, might be cheaper if it was a regular contract.