The "Thirsty Light" is simple enough, measuring the electrical resistance in your houseplant's soil and flashing an LED when it appears to have gone dry. They'd be a waste to use in each pot, but at just $10 a pop, one might be a handy reminder that it's time to make another round with the pitcher.
Product Page [ThirstyLight.com]
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I bought a plant that wilts very dramatically when the water supply is low, and I hung it in my kitchen. Whenever I see it starting to wilt, I make a round with the pitcher. It's nicer looker and doesn't require manufacturing/batteries.
"They'd be a waste to use in each pot"
Indeed. But get the price down to where it's about about a magnitude lower (replacing a plant multiplied by the "forgetfulness factor") - (say, maybe $3 total ) and you'd have a sure winner. Nobody likes killing plants, but nobody (that I know of) spends too much on them, either.