So, last nite I hit the mother of all potholes while approaching the Triboro Bridge (it will never be the JFK in my mind, but anyhow). Blew out my front passenger side tire. It took me and the Bridge Tow Truck Operator over 20 minutes to figure out how to get the spare out of my trunk - it was screwed in damn tight!
After we put on the donut, and all was right in the world, I went to pay my $6.50 cash for the privilege of driving from one part of the city to another, when the spare went flat. Same worker inflated my spare and escorted me off the bridge (god bless him),
$200 bucks later (as I apparently also "bubbled" the driver side front tire - so 2 tires had to be replaced) my car is now back in working order - wheel alignment seems okay so far too... knock on wood.
What does this have to do with gaming? It's Simple. The use of unexpected but needed expenses keep your campaign's players looking to earn more cash, or removes the extra cash from their pockets. I've had unexpected but necessary expenses at the same time this year and last - both coincided with my "holiday" check (we dont automatically get off holidays on my job - but we get paid for them in bulk twice a year). At least this time the DM above didn't take the whole check from me this year ;)