I am not a Scrooge on most holidays - heck, we even decorate our house for July 4, not to mention Halloween and Christmas. However, I feel about the same guilt in not celebrating Valentines Day as I do not having kitchen floors as minty-fresh as the ones in the Pine-Sol commercial.
When I was single, I used to love Valentines Day. Often it was a great excuse to get my girlfriend all romantic and full of wine, and, well, you know. One year when I was in business school and was sans g/f, I secretly left a red rose on the desk of every female in my section.
Since I have been married, though, Valentines has been one of those sort of grim opportunities to screw-up, like anniversaries. For the married person, Valentines is all down-side. Yes, I know a few couples who have developed some Valentines rituals with which they seem to have a lot of fun (power to them), but my wife and I never have particularly bonded with the day. This year, my wife and I swore off the flowers (its much more money to apply the money to roses some day she is not expecting them) and had a nice lunch al fresco on a beautiful Phoenix day. So I guess it wasn't so bad after all.