How much to ask for a startup?

Against the background of general hysteria about the need to get investment for a startup, I had a question: what exactly do most startups spend money on at the first stage?

Yes, of course, I admit that search engines and mass social networks, like other file hosting sites of various kinds, need money for servers for advertising + to complete product development.
But how many really need them?

We all know the story about millions invested in top4top . And personally, I immediately had a question: where exactly? The site does not offer any special know-how, the visits are not so great to talk about thousands of servers to support its work. Advertising in the internet was, but I would not say that it is very expensive and intrusive (ie, inserted everywhere). So where did the money go?
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For example, our startup on these pores really would not hurt some money. But just “a little”. $ 5,000 would be “bigger than a head” in order to complete development (without being distracted by earning money on subsistence) and buy several servers at the initial stage.

So, the question I ask you to answer in the comments is: how much money really (I pay attention to this word) a startup needs at launch:

• Product refinement
• Servers
• Advertising campaign

The more examples from the experience of real startups you bring, the more useful this comment will be.