Naaw you're thinking in the past tense.Lets see, he comes over, he gives you a quote, you give him a beer. He gives you a better quote, you give him another beer and so on and so forth. This could work out real well for you.
The proper proactive path to that is I take him over there at the end of the day AFTER he's had several beers on his own. If I just happen to offer him a couple when he gets here than all the better.
A casualty of the industry, painter's drink. Whether it's a car or a house,..statistically speaking.
Beer is the "cleaner of choice" painters use to wash things down, having breathed dust and fumes all day long.