Because I thought he was dead.
Honestly, when it came my turn to choose a character, it seemed that good ol' DC had killed another of their teenage legacy characters. They have a pretty bad track record when it comes to that, and I was annoyed that they had done that. I wanted to see what the writers here would do with him. As it turned out, he wasn't really dead (and they dragged this event through three issues), but by the time I learned that, I had already chosen him. Not that I'm unhappy with my choice, mind you.
Jaime Reyes is more than just a random legacy character. He is unique enough to strike out on his own and come out from under the shadows of the other two men that have called themselves Blue Beetle. On top of that, I quite like the fact that he is one of the few heroes that does not opperate out of a fictional city (as most DC characters do) or New York (as most Marvel characters do). He is from El Paso, and his roots there as well with his Hispanic family play a large part in his personality. In any case, he is probably one of the best DC characters created this past decade, and I look forward to see what everyone brings to the table this week.