I live in London. Years ago I called a plumber. We started chatting. He casually mentioned that he was going on holiday for 2 months to his house in Greece, and he was going to send someone to me, but he was in the area and just around the corner and this was a 5 minute job (I paid 65 GBP). I'm self employed and do very well, but a plumber having a house in Greece and taking months off at a time, got me curious. Turns out he started in plumbing in his late teens. By his mid 20s he had his own little company. By his 40s his company has expanded to the biggest and best plumbing company in the Greater London area, employing hundreds of people. His clients included a dozen 5 star London hotels, stadiums, gym chains, malls, restaurants, department stores, etc. Everyone has kitchens and toilets. It might not be a glamorous job, but from that day, I realised that sometimes the least glamorous jobs, can be very lucrative indeed.