I got this plant in September 2010, and have never seen it bloom. There was some brief excitement in 2010, when a flower bud formed, but it dropped without opening. In 2011 and 2012, I didn't even get a bud.
But this year, hey, finally a flower:
There might even have been two. (I'm writing this on 23 December, so I don't know how the other buds fared.) So what changed?
Well. In 2013, shelf rearrangements led to this particular plant being on a shelf about 2 feet lower than it had been previously. That's all that changed, as far as I know, but it seems to have been enough. It wound up further away from one source of artificial light, if only slightly, and a second source of artificial light was blocked by a bunch of too-tall-for-the-shelves plants next to the shelves. Plus, being closer to the floor meant it was a lot colder. Colder + darker = blooms. Apparently. So it can be done.
UPDATE (2 January): I think it wound up just being the one flower. Maybe two. I didn't keep as close of a watch as I probably should have.