The whales already have it.It's not "common sense", it's conjecture.
This will 100% surely drive more players to try harder for the mount, meaning more sales in tokens being an inevitable result. Some might buy the mount entirely from tokens, others might use the token to supplement their gold.
People act as if 400 EURO to get up to 5 million from 0 using tokens is some way-out-there number, yet there are dozens of boosting companies working for over a decade by now selling rare shit in this game. Many of whom are the ones to insta-cap rare mounts/items on the BMAH. And let's not forget the TCG mounts, I know for a fact that they're still peddling Spectral Tiger loot codes, and those are worth 1300+ USD as of this moment.
Now consider if the player already has 2 million, 3 million... Not far-fetched to think they'd supplement as they see their goal getting a time limit on it.
It's a smart move. Scummy, predatory, but smart. And why shouldn't they, it works. Even Day of Dragons still has sponsors and people making excuses left right and center.