I guess the thing is that although Youtube rewards a certain length video with monetization, etc., stretching 30 seconds' worth of information to fit the time doesn't really cut it. And to make a video about tires more interesting to watch, making the viewer willing to wait for the punch line, would probably have required a second person to do filming outside the car.
A wet road would actually have been fine if you used it well. You could take closeups of a tire cornering in the wet, splashing through deep water, the car making spray, and even the camera getting fouled with water, while you make points about wet cornering, braking, resistance to hydroplaning, etc.
The in-car video you ran for several minutes while you talked over it could have been done with cheap Chinese crap tires form the local Sav-A-Mart. It did nothing to illustrate anything you were saying about how good the tires are.