So I have been reading though a lot of the materia posts and haven't seen this yet (at least I haven't yet, this is my first post and I did register today, look at me)
So here is my idea, with all the talks about how you lose all your gear when it blows makes it not very appealing to try to bind that +1/2/3 piece of gear, not to mention the fact that you cannot do the U/U gear (which may change in the future?)
My Proposal: A failed attempt loses all the materia and proceeds to break your gear to the point that you cannot wear it until it's repaired. (and I do not mean with DM) So make the item tattered, worn, ripped etc. Then it has to be repaired before you can wear it. The only thing I am not sure about is how to handle U/U items maybe if you can meld SE can use the same system to repair U/U items as well. (get the materials and put in bazaar)
The next part of my topic which may have already been addressed (I haven't seen it yet and could of missed it) is, what happens you have your shiny armor and matera in the new bazaar / meld thing, can anyone attempt it of level or will there be restrictions? Granted you put your items in it's at your own risk but if I am not a crafter and I think it's 25% and it ends up being more like 10% if it blows I lose everything because I couldn't stop them before knowing the %. I would be more apt to meld something at 25% vs 10% and at some points I wont care but I know a lot of others would have an issue with it if it was under even 20%.
So those are my ideas for my first post.