Well I'm currently still making the first one; I was struggling to think of what game to make! So none sold yet but I'll tell you what the plan is at the moment:
1) General public but a bias towards casual gamers; generally 40 year old women.
2) There are lots of online distributors that will sell your game as a download and provide advertisments but will then take a percentage (usually around 40%-50%) of the profit. A few of these places are Big Fish Games, Reflexive Arcade and Garage Games. They invite you to send them a demo of your game which they will test and then let you know if they are happy to sell it for you. The game remains your own property and you can distribute it through as many of these places as you want.
3) I think the cost is negotiated by the site you sell through. around $19.99 (roughly £11) seems to be the norm. As I mentioned they are casual games aimed at a market largely comprised of 40 year old women. The most popular genres are normally puzzle, card, strategy and action. By action I mean games like Zuma or Luxor. This is not my favourite set of genres and I've never made games that style before so its slow progress at the moment but hopefully it will be worth it! For a general view of what style games they are then check out one of the online ditributors.
Here are the websites of the distributors that I mentioned:
http://www.bigfishgames.com
http://www.reflexivearcade.com
http://www.garagegames.com
Quote: "---Sorry for all of the pointless questions (and the bump). You don't have to answer them if you don't want to, I just thought I'd throw them out there due to my curiosity...
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Not at all; I just hope my answers were useful!