I think that both Dream3r and CashmereCat make valid points. DRM has come up as a topic on several threads over the last year or so, and indeed most of those arguing for no DRM are speaking as players. However, I am interested in making commercial games, and for that I have to have some assurance that I will get paid. Without DRM, I can forget ever trying to make a commercial game, the income will not be greater than the costs.
Touchfuzzy made a very good point on another thread (which unfortunately I can't find, so can't give the link). My paraphrase of his argument is this:
Games are still sold, and not just pirated, because there are people who recognise that justice requires that the developer receive payment for their labour, and without that payment there will be no future games from them - they'll go bust. There are enough of such people to keep the market in operation. Those who pirate are acting as parasites on the backs of the legal buyers.
I do not wish to support the activity of parasites, so I argue for DRM.
Touchfuzzy made a very good point on another thread (which unfortunately I can't find, so can't give the link). My paraphrase of his argument is this:
Games are still sold, and not just pirated, because there are people who recognise that justice requires that the developer receive payment for their labour, and without that payment there will be no future games from them - they'll go bust. There are enough of such people to keep the market in operation. Those who pirate are acting as parasites on the backs of the legal buyers.
I do not wish to support the activity of parasites, so I argue for DRM.

