It's obviously a standard practice to tip van drivers, whether you like it or not. Do what you want. There's no written rule either way as to how you want to spin it. But buyer beware: If you don't tip, make no mistake. You will you be judged as a cheapskate by the driver and the rest of your crew that tipped. No doubt about it. Giving a buck to the driver ain't gonna break the bank, especially with the way airlines are paying these days, even the regionals. It's a tiny portion of your per diem. Like 1/10th.

If you don't wanna tip, that's your discretion. You can keep justifying it any way you'd like to make yourself feel better about not doing it. Like it or not, we will judge you. Especially when even the FAs are tipping and you aren't. Happy tipping!