There is more interaction on Sports than I have seen on Steem in ages and may it continue to get bigger.
It is true that there is more interaction in Sports than on Steem.
In Steem your posts can get easily lost there because the platform caters to a diverse set of interests and topics. That is not so in Sports because all the posts are concerning sports and only people with at least some interest in sports would gather here.
In Addition, someone who followed me on Steem because of my post on topic A, may not be interested in a post on topic B from me and is unlikely to interact with me on that topic. So it does help to be a single interest platform.
Whether Sports will continue to get bigger would very much depend on the users here. If more and more people adopt your style of rewarding others, then it would grow fast, otherwise the growth is likely to be muted.