A few years ago, you were trying to find someone to take over your round when you went on holiday. You were offering just 50% of the invoice as, I think you said, it's your van, your tools and you like making money.
Perhaps you were sat in the sun at Disney Land, having a bud light and laughing that you were getting paid? Human nature after all.
Who cares if they're making their working day more pleasant? Enjoying the sunshine instead of being stuck in the office for most of the daylight hours? Good for them.