The more people who know you, the more cards you are likely to get for Christmas, and possibly, for your birthday, but for Valentine's Day it's a different story: the older and better known you are, the fewer the cards you get.
For kids, Valentine's Day is a friendship day. I clearly remember giving and getting quite a few cards back in the early grades, from girls and boys alike. By my pre-teens, the volume of cards was down considerably. All that changed in high school, by which time I was getting into "that special someone" territory. Now I only cared about getting one card, preferably with (I cringe as I recall this) something like a statute of a little bear saying, "I wuv you this much."
Now, having had the same valentine for over twenty years, the day is less significant for me, only because my wedding anniversary and other personal observances with my wife are more important and romantic than this commercial holiday. She doesn't eat chocolate, and already gets flowers from me once a month. Nor does she care much for fancy jewelry, though I get a kick out of ads from a certain company that suggest that giving diamonds is all but an out and out necessity for properly celebrating Valentine's Day, Arbor Day, April Fools' Day, etc.
Even so, I don't want be a Valentine's grinch. It's still a fun day for friendship, romance, getting an early start on your taxes, whatever.
There are quite a few on-line sites for valentine shopping for gifts and cards including traditional items at