Looks like they need money fast. And it seems to work.

The way it works is:
1) Platinum buyers and more put Hyper Tickets in cs. Cash for STS and gold for Platinum buyers. Farmers spending gold.

2) Farmers farming and selling Gold Chests. Gold comes back to farmers.

3) Platinum buyer buying Gold Chest and opening. Cash for StS.
3.1) Selling Mythics in cs to farmers/every other player. Gold back to Platinum buyer to buy more boxes. Keeping the cycle alive.

A problem arises, when Platinum runs out and/or Gold boxes get too cheap, making it worthless to farm.
As long as Platinum is no issue the cycle will continue.
Platinum Crates are actually a smart way to bring people back to farming, while at the same time getting some gold boxes out of circulation, thus increasing the price of Gold Chests again.

The problem seems to be that the Platinum chests are crap. ) Correct me if I'm wrong.

Another non economy related problem is, that farming like this is not enjoyable, but that doesn't seem to matter to the creators as long as the $$ is flowing.