This was an interesting question, but it seems the admin didn't see it or ignored it. I read the whole thread, and I think I agree with examplens. Teleporting an account more than once should not be allowed. examplens already mentioned the points why someone should not be allowed to teleport multiple times. Someone ranked up on other forums, which means they were active there but not here. They should be active here to rank up if they want. For me, I became a Legendary here already, even after teleporting as a Sr. Member, while I am still a Hero Member on Bitcointalk. It's because I was active here.
Now, coming back the reality, I was allowed to teleport my rank twice. I vaguely remember, but the first time when I teleported I was either full member or a Sr member. And the second time, was my Hero membership. The admin was kind enough to accept my application. Tbh, I don't believe it's about posting there more and less here. Ranking up at BTT is far more difficult than ranking up here. One has to post a lot of quality posts to acquire the merits. But here, if you are simple active and posting on a daily basic, even in a single line, without spamming or breaking the rule, you can basically rank up. Yes the number of required might be massive. but it doesn't have to be of top quality. But at BTT, even if you post daily, unless it's of quality you simply cannot rank up.
The rank up requirement I said above (I can be wrong though). I don't know how many factors works behind ranking up here. The last time I check, or aware of, is that you just need a higher number of posts....
What I'm trying to say is, I believe it is somehow justifiable if users can teleport multiple times. Maybe not multiple but a certain number of time. For example, 2 times.