Does anyone know the actual percentage chance of cubes advancing an item to the next rank, adding a line, or selecting a particular stat?
No but I've only heard estimates. 10% from rare to epic with super cubes, 5% to unique, and 2% to legendary. I wouldn't trust those numbers though. --- NNID: BowMasterPit Married to Flannery; Official Scyther of the Pokemon X board
My cape cost me 120k Nx worth of cubes (most of which were during that 800 nx super cube sale a while back) to get to 15% all, which is what I just settled for.
However, a random Loveless wand I've been working on went from 3-l epic to 3-l legendary, 35% boss 9% magic attack in a grand total of 20 super cubes, all of which were free because of this event. --- http://i213.photobucket.com/albums/cc157/peekatchu/Other/phainopepla.jpg
that sucks man, but they had some event they gave you epic 100% scroll recently ( i forget which event) if you have more than 1 account coulda got a few from there and been trying for unique anyhow. i got pretty lucky with the cubes.. i ended up using about 6 to get a racc mask from epic to unique and another 6 to get a necklace from unique to legendary. First legendary thing i ever made :D
Within 20 super cubes that I bought during some sale before AB, I got a pair of spectrum goggles to Legendary from Unique, (9% INT + 12% DEX), as well as a Kaivesurnet from Unique (now 29% DEX) and an Angelic Emblem from Epic (9% allstat + 12% crit rate).
It's really just up to luck. --- Guild Wars 2: Jedwardian