This atitude a modern day public entitlement encouraged by tabloids and selfish fans. Its unhealthy for the public and the entertainers. The fact that this attitude is what the public defaults to is the primary reason the "truly wholesome professionals" are gone from entertainment and we've been left with folks like Trump. You've created an environment that is actively hostile to the average person maintaining their sanity.
Similarly, the obsession that people have with taking pictures and knowing everything about an entertainer and invading their lives is why there is such a ridiculous level of fortune associated with these roles. No one in their right mind would do it otherwise.
This attitude drives the very principal it purports.
I think you're missing the fact that the bosses of the establishment aren't paying their employees fair wages and thats the only reason the tip is needed. Im not paying 25% for shit service. Tips are a GRATUITY for doing a good job and equate to a BONUS. They are not, nor were they ever, a defacto part of someone's earnings.