do what

I have always been thinking of to form a web site ,it should be interactive and provide values to people but did not come out one result yet. I think the site should meet those criteria:

1.interesting , not only to me but also to most web surfers which they will take delight in from it;
2.real value ,that the site will really help them, not just to know something from the site,but also helpful to make things better in their real lives. I do not like the idea of virtual reality or online games;
3.interactive, people can construct the site collaboratively, with less control. that site of the people, by the people and for the people.;something like the concept of wiki, but as I can see, those current available wiki sites are quite "static",the appearance is more like the output,and can not find the delight during the editing, though it has a large population around the world, driven by pure ,ideal spirits;
4.Reliable profit, it might be too naive to think of this at this very early stage ,but I keep wondering how could there are so many sites launched but few can tell a clear pattern to earn money. Yet there are so many VC are giving the money into this industry. The future itself can not make any reality at now