Even the inventor of the Keurig machines is horrified by the waste involved, and admits he didn't think this through at the time he invented it.

http://www.eastbayexpress.com/oakland/waste-the-dark-side-of...

And actually, I do think that people who consume heavily packaged foods all the time are being needlessly wasteful and should feel bad about it. Do you not see the fallacy in your argument, of replying to a complaint about people who generate this sort of waste on a regular basis with questions about whether the other poster ever does anything wasteful? Of course s/he does, we all do. But there's a huge difference between occasional and systematic inefficiency.