Friendly advice for anyone to check their local currencies rate for any royal crystal purchases. I know in my local rate, the only accurate bonus is for the 2200 Crystals purchase. The 5750 and 12000 crystal packs actually provide less crystals per dollar than the bonuses listed with them. I’m assuming it’s currency conversion from USD to local at least, but I could be wrong.
Based on what I found in my local currency, the listed “Bonus Crystals” are more likely a percentage of the crystal amount for that package, and not the cheapest package. IE: 5750 Crystals is 15% of 5000, and does not refer to a 15% bonus compared to the original package price of 1000 Crystals.
TL;DR, divide cost of Crystals versus dollars to find out which is the best bang for your buck if you are buying Royal Crystals. Currency conversions sure didn’t do this justice.