I thought it was pretty obvious, but here are some numbers for you. According to http://phx.corporate-ir.net/External.File?item=UGFyZW50SUQ9N... over 300,000 people had installed the Crock-Pot app for iOS by 2010. It costs $3.99 so that's $399,000 in app sales, plus whatever happened in the last 4 years.
Around 75% of homes in the US have a dishwasher. Nearly 20 million dishwashers are sold in the USA each year. http://qz.com/29147/death-of-a-dishwasher-families-around-th... For comparison, only 5 million homes are sold in the US each year, so it's not just that they come with houses and are never used.