Raymond Johnson, a PhD student at Southern Seminary, just published a very helpful essay on tipping and the gospel at Baptist Press, the official media outlet of the Southern Baptist Convention. It’s worth reading and considering. Here’s a snatch:
Whether Christians are aware of it or not, a subpar tip is a stumbling block in communicating the Gospel. It causes unbelieving servers to think that we, as Christians, value money over everything and everyone else (1 Timothy 6:10). So, my coworker, like many other servers, interprets such actions (poor tips from alleged Christian people) as stingy. Tragically, the result — though it may be unfair — is that many servers have identified the majority of Christians as a contingent of people who care little for others. They hear Christians promise them that God is just and fair and that He is a generous King who is lavish with His mercy and kind toward others. Christians promise them that the Gospel they preach is for all people right before they metaphorically clinch their money in their fist and tip poorly; refusing money to laborers who are worthy of their wages (1 Timothy 5:18; Matthew 10:10).