I don't know about the financial aspect...but given everyones differing tastes...it really not hard at all to believe that only 20% sell well. Especially these days when reviews are easy to find. back in the mid 90's and before you'd have to get a magazine awhile after a game was out to know if it was any good...now it's within a few day of release.
Remember Atari's ET? supposedly the worst game in history (I had and played it and didn't think so) but it sold tons due to lack of rating knowledge in today's market it would have bombed almost instantly.
Bookmarks