Comic books have a bigger audience than ever, as far as I can tell. First, you've got the old-fashioned issue-by-issue die-hards. Then, you've got the people who wait for trade collections to come out (I fall into this category). Thirdly, you have people who buy independent graphic novels and one-offs (also this category). Finally, you have people who love comic book movies; not really comic book readers, but their money still helps to keep the publishing companies afloat (this category, too).
I may be wrong about the breakdown, but these are the audiences as I see them judging from the way my local comic shops are set up, and they seem to be making a hell of a profit.
I actually spend a decent amount of money on comics. I just won't buy individual issues because I don't have the space to store them and I like to have books arranged on bookshelves where I can see the spines and access them easily.