Curently employed by Aldi so heres my understanding
Aldi pays really well. To be able to pay that well we run with 2 or three associates and a manager per shift split into morning /night shifts.
Instead of paying cart jockeys (the worst job at a store ,hands down) the cart corral solve so many problems. No dented vehicles from stray carts and it forces people to slow down leaving knowing families will be out having to cross to put it back. so much less parking lot drama.