Best price for software?

[Krik]

As we can't change the price per unit after rollout it's very important to set the right price during development.

But how do I know how high I can go before loosing too many potential costumers?
How do I know how many copies I have to sell before reaching the break even point (dev costs vs sales)?
What is the right (not too high, not too low) price to beat a competing 'great' product with my 'good'/''mediocre'/etc product?

I know it pretty easy to earn millions but IMO the game lacks these important figures. Or are they somewhere and I didn't find them?

[Qoff]

I always use the default option and it turns out very profitable

[Thorskin]

Pretty much what Qoff said, you add the features you want then price on where it says "Price" to generate what recommended pricing. I personally like to raise it or lower it to get a nicer looking price, but that doesn't matter in the game itself.
Say the computer recommends I sell a game for 78.34, I'll raise the price to 79.99. Or if it suggests 74.48 I'll lower it to 73.99

[Krik]

The reason I ask is the following:

In my game there're 5 different OS on the market that have a combined user base of 2.8 million. According to the software dev start window there are about 130 million potential customers.

I asked myself why is the active user base so little? Afaik there are only two important factors: price and marketing.
All the OS have max. marketing so only the price factor is left. The prices are in the range of 200-300 bucks.

So what if I develop an OS and sell it for 50 bucks? Would I get a much, MUCH bigger user base? Will this also come happen if my OS' quality is mediocre?