I've done some consulting work for him in the past.
Honestly... He's sort of a jerk sometimes, and he makes some really poor decisions sometimes. But he's honest, and he's not a total moron. He isn't suing people to create some kind of crazy profit center, he's trying to deal with people using forged or incorrect tickets to get on buses. People like to point to his (admittedly a little wacky) terms and conditions and imply that he's suing over stupid shit. He's not, so far as I know. He's suing over people who do stuff like print three copies of the same ticket and get on three different buses that are running the same schedule. This isn't about "socially acceptable behavior", for the most part. (Some of the later stuff, like the defamation claims, was pretty dumb IMO, though.)
And everyone jumps in with some "oh, hey, I know how you could easily solve this!" solution. It's like the thing where, if you spend ten years working with doctors to try to treat insomnia, anyone who hears about this will suggest you cut down on caffeine after dinner. Because, obviously, neither you nor the doctors have ever thought of that!
Yes, there really are reasons that checking passengers against a manifest is at the very least a substantially higher cost than the (fairly small, compared to the user base) amount of fraud. Yes, there are reasons it probably wouldn't be a good tactic at all. It's not that he's too much of an idiot to think of this, it's that he has more information about what is actually happening than those of us who are reading couple-paragraph summaries over the Internet.