Dont you think they are robbing the reward pool at present from the people that need it, and entered with an intro?
No, they aren't!
Posting using the #introduceyourself tag does not guarantee that your post will be upvoted and rewarded, unless there are dumb curators or misconfigured bots that blindly vote for such posts. But then the responsibility lies with the owners of those accounts, not the authors.
the HIVE TOUR can think about adding DECLINE to the introduceyourself...
I don't see the point of such a thing since we don't do any particular curation for these posts, nor do we pay special attention to people who do it multiple times. We just track if it's been done at least once.
Everyone is free to post what they want, when they want, using the tag(s) they want, and have any reward expectation for it. I see no problem with a Hive oldtimer that hasn't posted an intro post deciding to do so now. This is the case for me, for example.