You do realize that PC game sales have not gone down over the years right? They are just spread out among WAY MORE titles and I am not talking MMO's. They also look at PC install base as having grown exponentially over the years, but the PC game sales did not grow at the same pace...way too many reasons that are pretty logical, so I shouldn't have to outline them.
You cannot compare game from 20 years ago to games today. Back in the 80's gaming was new and there was a lot less to choose from, therefore it was much easier to be impressed & entertained.
How did those old devs make money back in the day with such a limited audience and why is it so hard to do the same thing today?
Full games back then could be made in a month up to 6 months. Didn't require teams of 30 to 50 people and graphics engines that cost half a million or more to purchase.
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