I've seen multiple special offers pass by, but they're either not worth it, or the new units aren't included.. :/ And usually when the units are included, they're more expensive and give less.
Take halloween for example, there was a special Halloween offer (containing a lot of stuff and a decent amount of sapphires) but lacked the new units. This was $39.6.
There was another offer, including those new units with less sapphires than the Halloween offer. This offer was $49.5!
My feedback on that would be, make those offers more appealing. As well as for rich people as for people who can't or don't want to spend much.
If you combined those two offers into something where it was $27.4 and gave the amount of sapphires and the new units from the unit offer + the other items from the Halloween offer, then it looks a whole bunch more interesting. Trust me, people buy more if they get what they like and are assured it's more or equal in value.
I know the 'Total Value of Bonus Items' is a thing, but it's not appealing. Nobody looks at it, unless you're blinded by the looks of it. Usually they look at the amount and quality of items, the amount of sapphires and of course the pricecard. If those four don't get along, they won't buy it.
Now I'm not here to criticize the place! I'm just giving my feedback on this.