There's a difference between buying for things you literally need and addons in a video game. People don't need money for motivation, hell, look at brian smith and truce and port and other people. they work for months or maybe even years on amazing addons that people don't pay for.
You clearly have no idea what the OP means and should reread.
When I was talking about buying for things you need, I was talking about people making a living while developing. If they are able to make a living and make us addons, then they can have more time making addons instead of having to go to work, go home, work in the few hours of free time they have, etc.
Its true that money isn't the only motivater, but its a pretty good one.
Yes there are free games, but the best games cost money (Starcraft 2, Black ops, Minecraft, Blockland, + Hundreds of more examples).
Things don't have to cost money, but if you want the best your most likely going to have to pay. We are seriously lacking mods that will only come through paying cash. I wonder how much Blocklands community would grow if there were more neat additions to the game.
Thanks for the support Shell, and the good arguements =].
On one last sidenote, remember, if most people can make something it probley wont cost money (I.E., simple addons such as server vote), but addons that not everyone has the time, skills, motivation and so forth to make (such as Iban's ZAPT, RTB, Iban's City Rpg that never was released Greek's Slayer) would be the things that cost money, and rightly so. They are bringing us nice things for our enjoyment.