Valentine's Day, even though i'm single and won't be celebrating, i think it's a big con and a waste of time and effort. Why have 1 day where you need to make an effort to show the one you love that you love them by buying cards, chocolates, movie tickets, making food for them etc.
Never celebrated it even when i was not single, and i was dumped because i told my now-ex that i don't celebrate false holidays, so don't expect a card or anything on the day.