If you really want resteem a lot then you might fall under the role of curation. They resteem the best they find in a given topic(s) but not everything. They upvote, comment, and make a daily or weekly post about the best of the best.

They want to gain a following from providing this service. They can sometimes amass a very large powerful following that can bring people in 10-$100+ in upvotes from the community that forms around them.

Here is an example of some of them.
https://steemit.com/curation/@clayboyn/clayboyn-s-curation-corner-1-18-18

https://steemit.com/ocd/@ocd/ocd-daily-issue-169

https://steemit.com/curation/@curie/curie-author-showcase-january-18th-2018

It's a very hard road to go down as it takes a lot of effort, time, and building up a community. Many people try but they often don't get anywhere.