Because of the avatar, whenever Shiv posts, I just imagine Shiv's hairy head with glasses with huge Golbat wings for ears.
As for the topic of hand, there are those of us who don't like the tournament taking forever. Here's my selfish reason; last tournament, I had to wait over two hours for my bracket match with Kyle in loser's finals. I really shouldn't wait that long for a match that late in the tournament. Another reason is that it's Saturday night. I want to finish up the tournament by 10 so I have the freedom to leave and partake in other social activities. People will have the freedom to smash once the tournament is over anyways.
Although I will agree it is unfair to Kyle, it's unfair for the rest of the participants who have to wait hours. I don't necessarily agree with the rule change, but it's something Rob is attempting to enforce because so many entrants are coming late. He doesn't want to not let more than a dozen people enter because they are all late because that would make them hesitate to come next time. If everyone could just be punctual, we could avoid these new rules. However, it's unlikely so many participants will suddenly show up on time so Rob is trying to use these rules to make up for lost hours and that's something I can appreciate (since I'm not Kyle).
Another worthy reason is that some Phoenix drivers also don't like the tournament ending so late because driving home late and tired is reckless. It can be as irresponsible as driving drunk.
Lastly, because John's too nice to say this even if he thought it (I don't know if he is thinking this), but it's a possibility he doesn't want all these people at his house so late into the night. I can definitely say that his roommates aren't happy with people overextending their stay, at least. That's some courtesy you need to consider.
There are other reasons I could list, but they're kind of petty. The points I did list are ones that I believe are very important.
I can respect the concern about ulterior motives, but I don't believe that's the case at all.
TLDNR; This type of rule is not unprecedented at multi-game events. Although it's unfair to the entrant that wants to enter multiple games, it causes significant issues for the hosts and that takes priority.