It's pointless because there is no karma system on lemmy and therefore no karma requirement to post on certain communities. Aqcuiring upvotes on multiple posts does nothing in the long term. My thinking was that a system like this might end up leading people to place quality over quantity when making posts.
As far as I can tell, there isn't a place where the total number of points that you have as a user is displayed. This takes some value away from simply mindlessly pursuing points as points would be attributed more to the individual post rather than the user.