@Cryogenic Where have I said your neighbour is a fool and your dog walker friend is a fool? I'm still not sure what you're trying to achieve here - you don't seem to have grasped the point if you're asking me to do the flawed thing I've already pointed out is flawed, namely extrapolating from some snapshot of their business and assuming that the rate they earned in some small period of time is sustainable on an ongoing basis.
You've already shown that you've got things completely confused with the one example that could be verified, the matched betting one, I don't therefore have much faith in your anecdotes. I'm not sure what relevance the car I drive has to do with this?
Anyway - your individual friends/anecdotes aren't particularly useful here when others have collected data from multiple people in the business areas you talk about:
For example 48 individual babysitters:
https://www.payscale.com/research/UK/Job=Babysitter/Hourly_Rate
No where near the figures you claim
Likewise dog walkers - not to be sniffed at, they apparently earn more than the average salary but they're also no where near the figures you claim, they're around 26k.... in London! They can earn substantially more by keeping dogs overnight up to 64k... but again still no where near the £500 a day you're claiming:
https://www.dailymail.co.uk/news/ar...alkers-earn-64-000-year-trust-look-pooch.html