What would you do?

As much as I completely understand why you would do this, and would probably do the same if in your situation, as someone who has never seen more than 1b meso in my inventory, reading that someone would just throw away 4.5b meso like that makes me cringe.

The difference is is that 4.5b is a lot of money to you and I, whereas when Bryan goes out to eat, he throws out 2b just to tip his waitress