Amanda said:
Just don't check anything for the flight!
Spirit would sell you a ticket for an aluminum lawn chair duct -taped to the wing if they could. They'd specify a type of lawn-chair you couldn't buy, rent you one (Ka-Ching!); then require you to use their duct-tape (Ka-Ching!!) and charge you for a can of Goo-Gone to clean off the sticky tape residue (Ka-Ching!!!) Then charge you a catering fee for the bugs you inhaled (Ka-Ching!!!!) and for the toothbrush to clean 'em off your teeth (Ka-Ching!!!!!), the toothpaste for the above (Ka-Ching!!!!!!) and the water to gargle with (Ka-Ching!!!!!!!). Then comes the environmental disposal fee for the water you've gargled with (Ka-Ching!!!!!!!!) or a can of Spew-Gone to wash off the tooth-pasty water when it hits the side of the A/C (Ka-Ching!!!!!!!!!).
But people do love those low fares, and they're making money.