I would say I spend more now. In the past, there were some books (cookbooks, for example) that I would buy anyway. Many others I would get at the library, and I still will go there for 'just browsing' or for books I suspect I might not read again or am not sure I will like. But the 'pulpy' reads, I am actually more likely to buy now that I read in ebook more often. They are cheaper than the paper ones, which in Canada anyway go for $10 or so. And now that I don't have to worry about storing physical books, it's much more like an investment for me because I can keep them all (in the past, I would buy and then sell when I'm done). I recently re-read a favourite series of mine in print, and was really annoyed to find that some of them were missing, no doubt victims of a shelf space purge
So if it's under $10 and I want it, I'll buy it. But that's subjective. Nora Roberts, I may read again. Koontz, probably not, so I would get him from the library.
I also find that Fictionwise has encouraged me to spend more than I used to
What I do is have a monthly budget (say, $20) and then spend it exclusively on 100% Micropay titles (there usually are at least one or two a month which may interest me). In this way, I get a balance that I can spend throughout the month on other little things. I could buy a couple books a week and still not go over my $20! You can't do that in the print world.