We've done that before too, to great affect. I enjoy little Valentine's surprises for my girls and we always get a little something for them. But I take my wife out weekly and throughout the year will do little things. She will too. But when it comes to the day itself...we prefer just alone time at home, fixing dinner for each other.
It sure didn't take long to get the Valentines stuff in the stores. I had to go to the grocery store on New Year's Day and the "seasonal" isle was cleared of Christmas and New Year decorations. Already on the shelves were chocolates, roses, and all sorts of Valentine's items!
Funny you mention that...three days before Christmas I was rushing like mad to get stock for my stores and I arranged a rush shipment from SF. When the truck arrived we scrambled to get it all out and the first box I opened was all wrapped in Valentine's and not Christmas wrap. I thought about it for 5 seconds and then thought...who really minds hearts at Christmas?
Fortunately, that was the only box of Valentine's wrap I got. But guess what? It all sold...first. Go figger.