Instant hot. You can buy a instant hot water dispenser for your sink, and decades ago they were really cool and lasted for a decade, but the modern ones are all precision engineered for maximum profit to fail in less than a year, requiring plumbing work to replace. There are desktop hot water dispenser products but they cost about as much as a loss leader k-cup machine.

Also my wife has one of those re-usable coffee grounds things but sometimes you just want a quick cup and don't want to fool around. Today I'm running late and if I had an extra 5 minutes I'd stop at starbucks and blow $5 instead of 0.50 on this disposable cup or $0.005 on home ground. I drink black tea and I have an emergency stash of tea kcups. I think it slightly inferior but not that bad. It is much more bitter than my looseleaf home brewed. Obviously my kcup tea always tastes kinda coffee-ish which is a little gross.

I only drink one cup of coffee a day at most and my wife hates coffee, so rather than brewing even a small 4-cup pot, I'd rather not waste anything and just do the one cup at a time that my Keurig offers.

In other words, not only am I being environmentally responsible by not using throwaway pods, I'm also not wasting a bunch of coffee and paper filters using a traditional drip machine just to get my one cup every morning.