Just an update on this offer: the offer is currently $100 for buying three scared shards at $15 each ($45 total spend, or $55 profit). It takes an hour to complete.
My instructions on the first page still work as of last night, you just have to buy an extra $15 pack.
Importantly, these packs are only available for the first 24 hours after you start the game. So you need to be quick (it only takes an hour).
And a reminder: do not purchase anything until you have confirmed that the first 10 points have been awarded in Freecash - this confirms that the tracking is working! Also, do not open any sacred shards until you have purchased three of them!