I'm told a lot that the casual games market sells mostly to lower-middle age women. Did you ever stop to think why? It should be anything but. They aren't the people who are online the most. They aren't the people who go out to a store and buy a brand new game off the shelf.
it's more upper middle age, or maybe middle middle age. Anyway yes I have thought about it. These are the people that like off-line games like crosswords, wordsearch, jigsaw puzzles, sudoku etc who have money and who don't pirate games and who don't want to play violent games. They are well off, have computers and like playing buying and playing games. They won't buy some Indie developer's amazing shooter or physics inspired thing that all the coders think are cool, they'll buy a well polished addictive puzzle game perhaps with a cliche theme.Really there's a problem with definitions. Indie may mean people making freeware shooters, or retro-remakes, or weird experimental games or casual games that are invariably clones. Guess which sort sells the most? Should that be your only critera for makeing a game? Of course not - it depends on who you are and WHY you are making a game. Are you making it for fun as a hobby? If so, great do what you feel like - do it for art. Are you making a game for a job? Yes, aha, well try to combine your art with sensible market research and business sense so that you can continue in your job for many years. Pretty obvious really...