It seems like you are suggesting no matter good service or bad service we must tip !

Servers expect some give good tips, some give bad tips, some give no tips. If they don't like the way it is, they can move to another profession which has a regular salary.

We ought not to tip just because someone make their living off tips, only good service deserve a tip, and I should strentch that if someone don't give tip then the server provide bad service, that person should not even be in this industry.

Customer service jobs should never base on tipping regarding one in any kind of industry. It should view tipping as a bonus not requirement.