I think we need to get past the mindset that a business relationship and a personal relationship can't exist simultaneously.
I like you. You write things I benefit from reading, I upvote them and we both benefit.
If we're close, I help you move house and you take my kids for a weekend so I can take the wife on a sneaky holiday.
Whether it's informal bartering for mutual benefit or more formal payment for services rendered; they're each based on the idea that we exchange value for value on mutually agreeable terms.