The thank-you market (cards, gift baskets etc.) is a $4 billion* a year industry which is a lot of money to spend to thank someone for the lovely wedding present or the lift to the gas station or the spare ticket to the basketball game. How many people have ever said you're welcome? No one, because saying you're welcome is not socially acceptable unless you mean just saying it out loud right after someone says thanks.
What are you going to do about it? Why don't you send someone a you're welcome card or you're welcome gift basket? Find what you need at the new you're welcome emporium which just opened on the Internet. You'll thank me later! (And then you better believe I'm going to send you something in the mail after that!)
*estimated from my head.