It IS a hobby, you nit-wit. But it is still MY time, and I deserve to be compensated for it. I am the one who decides what to charge for my apps, not Microsoft, so you are buying from ME, not Microsoft, when you make that purchase in the store. Microsoft is just a selling agent. So when you decide to "share" accounts (steal), it is ME that you are stealing from.
How much I make is irrelevant. In my case, I give my apps away, and use ads to generate revenue. But that is irrelevant, because it is MY choice to do it that way, not yours. Only the developer can legally choose to allow his work to be free of charge. The rest of you who are doing it are doing it in direct violation of the law, and whether you WERE in full knowledge of it or not, you are now. And whether you knew it or not has no relevance, either - ask any of the people who've been found guilty of stealing from the music publishers and have had to pay huge fines. You're no better than the common thug kid in grade school who beat up the little kid and stole his lunch money. You just hide behind a computer to do it. I guess that makes you more of a coward.
As far as five devices in the same family, Microsoft doesn't have the right to give a family rights that only I as the creator of the work can give. Only the creator of the work can assign those rights, unless he enters into an agreement which gives those rights to another entity. I didn't enter into such an agreement. Microsoft can't take my one purchase and give five copies to five different people.