Actually, this wasn't my first--it should probably be Bad Guys, officially. (See my comment on your list page.)
Back in the mists of Wordie-time, my first list was simply a catch-all of my favorite words. That list grew too big, so I divided it (several times), until it morphed into the "'Cause I Like Them" alphabet lists. "B" now looks like it was first because it had the most words when I divided, so it was easiest to keep where it was rather than delete and start from scratch.
*wonders whether that makes any sense at all in the new Wordnik world*