The increasing gap between players and bosses.

@Lance: It was a nice thought though. Maybe they could make it like occult cubes and make them rare drops from bosses.

From bosses? You mean, those monsters that the unfunded can't kill? Yeah, that makes sense...

I still think that normal Cubes should be craftable, or possibly drop from normal mobs, and in reasonable quantities. I think non-NX-users should be able to get good Unique potential on all their items, and not by slaving two months on each item. NX-users will keep their Legendary edge, that's more than enough.

Pre-BB, the funded had double the damage of the unfunded. I think that gap was reasonable.

You say that botters will "win" if normal Cubes are available in-game? So? As far as the damage gap is concerned, it doesn't really matter if they do - they have to sell all the Cubes they farm (or sell the gear they cube with them), thus increasing the overall availability (and lowering the price), making it easier for the unfunded to get better gear.
Note that I'm not saying "botters are good for the economy" or anything of the sort. I'd be very glad if Nexon figured out a way to do away with them. But I am saying that the fact they exist is not a reason to put everything nice behind an NX wall.