We used to laugh at the occasional home seller who took his toilet paper and lightbulbs with him when he vacated (or evacuated, I suppose); cheap, mean ol’ bastards, but fortunately there weren’t many of them and no lawyer I know of ever thought to cover those items in a sales contract. Toilet paper is still plentiful and cheap, but light bulbs may now be a coveted, and expensive item.
The 100 watt incandescent bub is no more, the 75 watt flickers out January 1 and cfl bulbs are unusable. The suggested alternative for both incandescents and cfls is the LED, which currently (yes, bad pun) cost as much as $30 and even $50 per bulb. Homeowners who still have incandescents may start taking with them what is now literally irreplaceable, and if they’ve already installed, say, 100 of the new LEDs, they’re looking at a $3-$5,000 replacement cost if they leave them behind. It may take a few incidents where a new homebuyer arrives to a dark castle, but I predict we’ll start seeing this issue addressed in sales contracts within the year.