As I stated in the original comment - that is someone's choice to do.
If they want to upvote all their comments and upvote no one else - i think its logical to say that I doubt anyone else will use their upvote to support them at all.
I feel most comfortable supporting people who support many different people all around the blockchain!
But if someone want to NOT do that? And ONLY upvote their own content? hmmm that is definitely their choice. I don't think its very wise hahahaha but it IS THEIR choice LOL
and for promoting your post - I also don't see a problem with people promoting their own work for 7 days. I think its a choice, and its yours to make! One day - or 7 days - I'm sure each person has their own reasons for choosing what is best for them! :)
But happy to hear that you like to spread your support around! I think that makes the most sense when you are on a social blockchain! hehehe