Did you know that thousands of old domains are sold on auction every day? In fact, there are probably hundreds of thousands of them, but only a small portion of them are of our interest. Why should you care about someone’s old dropped domains?
Think about it as real estate online. Domain names are like houses that even though abandoned still have value. A new domain when bought has to be built up, links to be gotten, traffic to be generated, authority to be gained. Old domains have all that despite them being abandoned.
It is a great idea not to let those domains go to oblivion, buy them on auctions and restore websites. As I said, there is value in them. You can restore the previous site, or even create a completely new one – the links, traffic and authority is still there and you can use it to your advantage. Otherwise the value of old domains just evaporate, if not being bought out.