Another loner here. I don't mind doing everything alone, since I actually enjoy the whole process, from writing to colouring. It's only the online process that I really find bothersome. Webpages and promoting and all that is simply really tiring for me, which is why I usually keep a very low profile online.
I do think that sometimes it would be nice to have someone who would give me honest feedback and tell me if something is confusing or simply doesn't work. Especially during the process and not when a page is already finished. In my opinion having someone to bounce ideas with is the best part of working with a team. On the other hand working alone can be quite rewarding, since you can look at the end result and know that it was all done by you.