I really enjoyed this interview. I think its cool that the RS team is so invested in the community and are willing and excited to give interviews like this.
In regards to the silent majority of users and what they may buy, if I had to guess(and I could be very wrong about this), I would say that pop-punk is probably the biggest seller. It seems like there have been a number of bands that fit into that category, and I think it makes sense. They're fun songs to play, and fairly easy to grow into and feel competent playing them. While I am one of the users who is vocal about getting more technical stuff in the game, I can't discredit the people who are at a different stage in their musical experience. This type of music can be very rewarding to learn.
I'm not surprised that the polls on The Riff Repeater don't match up with the larger RS community. Ubisoft collects all of the data, including what people actually buy and play, and how they use the software daily. There seems to be a core group who follow The Riff Repeater, but I imagine that the actual Rocksmith user base is much much bigger.
I really wanted to hear Brian's answer to an artist that surprised him saleswise. He mentioned Imagine Dragons, but it was a little vague. He seemed to suggest that there were arguments about whether to include them in the game at all, and didn't really get into whether their sales surprised him. Brian and Paul thought it would be good to expand Rocksmith's audience, and I agree, but I am a nerd for numbers and want to see what sells the best. And that's an itch I will never get scratched unless I start working for Ubisoft, lol.
I also really liked Paul's points about variety being the spice of life. I really liked the setlists for both Rocksmith and Rocksmith 2014 because they had a nice mix of lesser known artists or songs, and I found it was fun to learn about some of these groups. Some I knew, and loved, like The Dear Hunter and Minus the Bear, but I like an eclectic mix as well. I wish we would sometimes get packs of more Indie bands, or do something like they did with the JRock stuff and have two packs hit every week, with one pack being a big name artist or variety pack, and then a second pack, maybe even just 1 or 2 songs, from a relatively unknown or foreign group released in conjunction with the first. I think this would be a great way to introduce new and fresh bands to the game while still satisfying the core users who want the big names.