
In my experience, cos we only learn that when we know a higher lvl player and can talk to them, f.e. in a Coop. I learned this way that some of my Coop partners were rofl-ing, when I asked whether I could ask for anything what I considered HIGH (anything between 5 and 20), and they said "I have 54" - or more
Now I dare and flag higher amounts if needed, too (and have some amazing helpers <waving>

), and usually try a mix, esp. as my trains ask for higher amounts as I am getting higher in lvls, too.