Why don't cardrooms spread NL smaller than $1/2?

[youtalkfunny]

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I once saw somone bring a roll of quarters to a 40-80 game because they only had 50 cent pieces on the table and he liked to tip 25 cents a pot.

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For years, St Louis players traveling down to Tunica would bring a roll of quarters to whatever game they were playing, as they thought tipping $1/hand was extravagant. I guess all the boats in STL had coins on the table.

This practice has since stopped. Having just read "Freak-onomics", I feel it is my duty to hypothesize on why this is so. I figure that either:

A. STL no longer uses quarters.

B. The introduction of coinless slots and the death of $1-5 7-stud makes it a lot harder nowadays to get your hands on a roll of quarters in a casino.