Why isn't ancient pulling on hellbourne banned?

<a class="member" href="/users/3447"><img class="flag" src="/assets/flags/01-a723e4585275f93c41ca7a874ff501c047799663bb2f2534c820d9ca3ea9ffa6.png" /> &nbsp;<span>OhNoItsNot</span> </a> Isnt it too annoying to be worth the effort anyway? Also its a valid tactic.

edit: nevermind ^^

If both teams have carry trilanes freefarming but hellbourne pulls creeps to ancients then that team&#39;s solo gets vastly more experience and the enemy team&#39;s carry gets less creep farm.