BB -

You may have found a site that you trust, but the persons receiving your cards may not know that it's reliable.

That means that if they know what the hazards are, or if they're in an office where security is enforced, they may not ever see your trite little "gift."

And "training" them by making "cards" a habit can't do much other than to make them less cautious when the phony one comes in.

I'd much rather get a personal email written by a friend that just says "Congratulations, ya ol' fart. Y'er a year older," or that tells me what my friend is planning for the holiday. (And your friends probably would too, if you weren't too lazy(?) to write.)

John