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That's a fairly Victorian attitude.
You need 2 people to do it safely, and even then it's still high risk.
You need to factor in their travel to your place, no matter how small - they didn't teleport to your house.
Kit and insurance, regardless of whether they have it or not.
How much would you want to get paid to do the same thing? Would you rather pay half the price to someone who's prepared to take more risks to benefit your pocket?
And if they do use ground-based machines, someone's got to pay for that
Dugtheslug
NotThamesWater
They don’t always use a ladder - there are machines that allow it to be done from the ground.
Even if they are ladderists, it’s a lot of money for two hours of fairly unskilled work.