I've been rating this way since before in app tipping. My in app tips and cash tips totals are usually about the same totals, usually cash is a bit more. Less people tip cash but the average tip is much higher.more often then tips, which is why rating on tips is <fill in the blank>. specially with uber since you are forced to rate b4 you know about a tip in the app.
So glad I ignore pax ratings; for this very reason.
I've received well over 2000 cash tips, I used to keep count. I've only received 2 $1.00 cash tips. 2 out 2000 plus. I receive more 1 dollar in app tips in a week than 4 plus years of driving.
I want to separate the cash tippers from other people. It's not personal, its business.
If I could, I'd give an overall rating of 4.9x to cash tippers. 4.8x to in app tippers and 4.7x to non tippers.
Where I am about half my pax I've driven before on any given day. If I knew the next ping 10 minutes away was a cash tipper I'd probably take it. If I new they were a non tipper, probably not.
Ratings are a tool, not some damn social status. In my opinion, you're foolish to not use them as such.