Imagine you had created a product that was quite revolutionary, which solved a problem for hundreds of thousands of people no matter how little an issue it might have been. Maybe this product was so convenient and easy to use that it flew off store shelves in droves.

After making a lot of money, solving a problem, and making people happy, the most logical emotion you’d feel is … regret, right?

That’s exactly what John Sylvan, the inventor of the Keurig single-serve coffee machine, said in an interview with The Atlantic.

“I feel bad sometimes that I ever did it,” Sylvan said. “It’s like a cigarette for coffee, a single-serve delivery mechanism for an addictive substance.”

The plastic cups that the coffee comes in also create a lot of waste.

I happen to have one of these machines myself and they are quite convenient when all I want is one quick cup — like a lot of Americans. But I also agree with Sylvan’s assessment that they are expensive and not tremendous time savers.

“I don’t have one,” Sylvan said. “They’re kind of expensive to use … plus it’s not like drip coffee is tough to make.”

This may be true, but I don’t see the sales of Keurig machines dropping off any time soon.