After doing some basic research, I've noticed that apart from 2-3 titles, there doesn't seem to be many business games (by business I mean games where you run business's financially, stock market, industry, etc that aren't the likes of sim something or roller coaster tycoon) done by shareware authors or even non indies. I reckon the market for them is much smaller than puzzle or action games, but I love those games. Even with a small chance of success, should I try to hit a niche market that many people ignore? (I know there are some people doing these games, but the ratio of developers/market is far less than puzzle or action games, and for what I have found, most of the games suck (no offense)).

I'm finishing my first one soon and I guess I'll be able to judge for myself. I'm doing this game for myself tho, because I couldn't find a game that I would enjoy playing in this area so I decided to make one myself, but would be interesting to hear other developers opinion.

I think there's a potential market there. I've got an idea for my next game that's partially a business sim (though that's kind of secondary to the main thrust of the game, but I do think it will add to the game's appeal). I think there are plenty of people out there who have a pent up desire to try their hand at running their own business but don't want to risk it in real life. Go for it! :)

I think you should really try.
While making my soccer game, I kept the financial part simple, because I didn't want to scary lot of potential customers from lots of numbers :P
But that's a soccer game. If you make a game in which you can play with stock exchange and so on, it may turn out fun.

I think the key to make a good strategy/simulation game is to make a good interface, which is a difficult task. I have redrawn from scratch my game interface at least 5 times before finding a useful layout :P

Good luck anyway!

Anyone else remember playing ancient CEO/stock market games in the BBS days? :)