[hkarthik]

I wonder if the POS companies take a share of the tip as part of the total transactions flowing through their systems.

Then they'd be incentivized to show the tip screen by default, and maybe jack up the default amount to 20-25%.

[justinpowers]

Most POS systems do not charge per transaction, neither by count nor dollar amount. It’s usually an upfront or flat monthly fee, based on number of terminals, level of service and feature set.