All for a Penny

Can you believe the esteemed/vaunted US Post Office will discard a postcard that lacks but a single cent of postage? That they refuse to put stamp machines in DC post offices because that would drop biz at the counter and reduce labor needs? Is this an operation for efficiency or a social subsidy? And how many postcards of mine got torpedoed in years past due to this silly rule? I really like and respect my carrier, but 5 days-a-week can't come too soon and maybe will prompt some overhaul of this kind of self-defeating behavior. Where's Kevin Costner when we need him?!