There are a lot of dropped/expired domains for sale. A lot of people sell these domains, and many people buy them without even knowing about it. They just don’t know what a dropped/expired domain means. If you’re going to buy dropped domains, later you should know that you can be rejected in all kind of situations that involve online business.
The first thing you can forget about is that no one will be interested in guest posting on your site. Of course, a lot of people don’t know about all this dropped domains thing, so they might be interested in publishing some articles on your site. However, everyone who knows about dropped domains, they probably won’t be interested in your site — especially if your domain has more than 1 drops.
To have a site that attracts a lot of guest posters can be a big blessing for the site owner, because free content is good. It could take a lot of time to write a lot of high quality articles on your own, so guest posting always helps. Having a few links in these articles won’t harm your site in any way, and you get FREE content. That’s why guest posting is good not just for the people who send these articles to you, but it also is good for you.
So to answer this question, “Buy or not to buy dropped domains?”, you should know your goals before buying such a domain. After building a big site on such a domain, you really don’t want to regret it later. Always think about the future and how you’re going to continue with your domain.