Recently visited the Metropolitan Museum in NYC. For years they've been criticized for advertsising that it's free but asking for a "suggested donation." It's 25 bucks. Big deal. Well worth it. The point is, if you ask to get in for free you get the stink eye.
I'm sure its the same in the KH's. "I'm sorry I can't afford a red cent." "Reallly Bro poor beyond belief? Not even 20 bucks?"