Wolfspider said:
$30 will fill up my car completely with gasoline--and that's saying something with today's gas prices.
$30 will feed me, my girlfriend, and her son for lunch at a good quality restaurant.
$30 is what the average person in America makes at a job after working nearly a whole day.
$30 is what I expect to pay for the average full-color hardback D&D rulebook that is a couple hundred pages long.
$30 is not what I expect to pay for a softback adventure printed on tissue paper with smudgy ink and recycled maps.
Unfortunately, though, I did pay $30.
Where I am (western NY), $30 will buy my wife and I dinner at a restaurant, once tax and tip are rolled in. And by restaurant, I mean one step above fast food, aka the Family Diner.
Even at a cheap station, putting 10 gallons of gas in either of my cars is ~$40.
The kid who comes by to help with raking leaves and stuff makes $10/hr, tax free. Even at minimum wage, you can make $30 in 5 hours, after taxes. I've worked minimum wage, for about a year. The good side is you have lots of time to think, and work is pretty low-stress. Bad side is you have little-to-no money to spend in your copious free time. I now make... a fair bit more than that, but with stress and deadlines and overtime.
Heck, $30 is 3 movie tickets at a first-run theater; a nominal 5-6 person-hours of entertainment. You should get that from the first 2-3 encounters, and there's 20+ of them. Also, time spent hanging out with friends is priceless.
EDIT: Mats
I bought ~2 yards of a fabric that has a grid of 1/2" black squares on a white background, with 1" centers. I draw on it with washable markers, and it's big enough I can get half a large adventure's maps drawn out (or all of a big dungeon) before I need to drop it in the wash. It also folds up nicely to fit in my bag of gaming books. Looking forward to 4e, so I can reduce my book-load from my current 3.5/AE/Eberron game.