Are you saying that's a bad idea? Why? The rich can afford to pay more because even if they make a little less, they're still way more than fine to survive comfortably, and society ends up reaping more benefit as a whole from that person because we're getting a larger percentage of large amounts of money. The poor have a hard time just keeping afloat in society as is.
Let's say you just earned a promotion at your job. To celebrate, you decide to go to your favorite sandwich shop to order a turkey sandwich.
"One turkey sandwich, please."
"Sure. That will be $8.00."
"What? $8.00? I ate here last week and it was $5.00. Have your prices gone up?"
"No, our prices are the same. You see, we have this special progressive pricing menu. Here's how it works. If you make X amount of dollars a year, then the sandwich costs $3.00. If you make Y, then it costs $5.00. And if you make Z, it cost $8.00. Because you just got a raise at your job, that bumbed you up to a higher menu bracket. From Y to Z. So that's why it was $5 last week and $8."
"So does the sandwich cost you any more to produce than it did last week?"
"No, you're just making more money now so we feel that you can afford to pay more for the same sandwich."
All this talking has made the people behind you in line a bit annoyed.
"Hey buddy!" one irrate customer yells "Hurry up. I'm trying to get a couple turkey sandwiches."
"That will be $6.00"
"Wait a minute." you say "So that guy gets two turkey sandwiches for less than what I have to pay for one?"
"That's right"
"Well, what if he had no job at all?"
"He would get the sandwich for free"
etc, etc, etc...