Siskataya (admin) has stated in the forums that they're perfectly fine with mule abuse of this offer.
Meaning that people are doing this on many mules (you get the PM, you get the offer. Make an account and I got the PM instantly.)
If people abuse this (which they do.) 10 times would be 5000 Cash plus 5,000,000 Gold, out of no where.
Add this up for how many users will do this and you can tell how much extra gold will be thrown into the mix of the market.
Causing possible inflation and fucking up their economy even more.
To counter-balance this I'd suggest removing the 500k and replacing it with like 200 extra Gcash / Removing it completely.
And lots of gold skins to repair some of the damage.
Edit:
Of course gaia would be okay with mule abuse, 10 times would be $50 given to gaia.
Just shows you how money hungry they are at recent.
Plus when confronted - Jak (admin) pretty much had the mentality of his posts were:
"It's funny, people were complaining about $250 items in Verge but they'd be willing to spend $250 for multiple teal boxes."
Not an actual quote but that's what I gathered from his posts.
Either way they would still be paying and my point stands a lot of games have special sales like this. No matter how absurd it may seem you can't really fault them when other sites and games have and will do a lot worse (ex. Maple story)