In my area (low cost of living), paygrades are as follows:
N3 10.00 cashier/service desk/sales floor
N5 10.25 instocks? food ave
N7 10.50 flow, backroom, POG?, starbucks, GSA
N9 11.00 PA
N11 13.25 some TLs I think
N13 14.00 more TLs
N15 15.00 this is where the flow TL is at my store (key carrier), not sure on specifics
N17 15.75 senior TL (TL with 2-3 LOD shifts per week, can be any TL but most common is sales floor)
So, lets say $4/hour. Given 40 hrs/week -> ~2000 hrs/year, this leads to about an extra $8,000/year compared to a team member working 40 hrs/week. Most TMs don't work 40, so a consistent amount of hours worked is also a huge benefit of being a TL. TLs are not guaranteed 40, but most do work 40 and then gain enough vacation to make up for the occasional week that is under 40, so it's a very consistent paycheck.