In my opinion it's better to not cast all your votes than voting for people you don't know anything about.

It requires some time and work to collect information, and sometimes there just isn't enough published to get a good picture. But it's essential to do so. You don't lose anything by not casting a vote, but you may hurt witnesses working on getting higher on the list by just piling up on the top.

I personally only vote for witnesses outside the top 20 to contribute to decentralization as much as possible. Minimum requirement is an active node and some information about themselves on their blog. Being active in a project helps, but with the few hive they earn on the bottom we can be thankful for everyone who maintains a witness node.

If you want to know more about me than my witness information provided, just scroll all the way down my blog, there are very few posts that are not connected to my work on hive throughout the years.