The smart golf cart helpers realize that they will get more hours on average over the duration of peak, safer working conditions, easier work, and possibly a free lunch by being an on car helper instead. And the problem is that you want your smart helpers on a golf cart and not a package car, because they're easier to train, need a lot less monitoring/management/assistance with DIAD issues and basic policy like "yes, you really need to get a signature on that signature required package", generally a lot safer, and so on.