What is the purpose of the 20 XRP cost to start a wallet?

What is the purpose of the 20 XRP cost to start a wallet?

Does the money stay in the wallet or is it used to pay for something?

If it's used to pay, who does it go to?

If it stays in the wallet, am I allowed to take it out and drain the wallet later without any consequences?

http://ift.tt/2lrQSFi

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