OK so looking back, it was almost exactly a year ago that they stopped selling XYZ. **Total Speculation Guess** The only thing I can think of would be they had multiple issues with spam complaints from all the super discounts of the June 2016 sales, when they were a penny to around 18 cents. Now any domains registered during that time have finally expired and gone through deletion, so maybe it was finally safe for them to offer XYZ again at prices comparable to other registrars?
If anyone knows for sure or asks support let us know!
They do have the best renewal cost, so for hand regs, they now beat out any other 99 cent offer. Maybe they will have a transfer special that beats $8.50 also : fingers crossed :