Path of Exile make use of an official tool von vkmoons Blog

 Ex: The main site itself has additionally seen some improvements as year, besides addendums to it including SSF ladders.

As for the children replicating the effort of another -

1) New players and casuals would much rather make use of an official tool compared to a third-party one, and Cheap POE Currency likely from the majority on the playerbase.

2) As they mention within the post, this avoids the danger of people requiring you to give their account details to third parties.

3) As they also mention within the POE Trade post, their new site also permits people from other languages to trade more readily. poe.trade is not actually good featuring its language support.

This new site will support every one of the languages the sport itself supports. That's a huge improvement for many people.