Who decides the price of expiring domain during auction?

Hi,

I saw in GoDaddy Auctions, DropCatch etc that for expired domains which is listed it is mentioned $5, $10, $12 or $15. All domains are not to be same price when expiry.

Who decide the price for expiry in auction the starting bid.

In a Domain Registar company, when a domain expired they listed into auction and earn that money too? Is it.

Who decides the price of expiring domain during auction?