All of the above answers are incorrect.
Bitcoin mining will always be profitable, for as long as there are transactions to be confirmed there will always be utility in "mining," even beyond year ~2140 when all bitcoins are thought to have been mined.
Alternatively, I agree with above re: BTC difficulty rendering all but commercial mining operations or cloudpools etc profitable being here, now. When I think about how, to date, the most reputable mining company (as far as I'm aware) is Terraminer I'm taken aback by the state of mining. After having shipped 1000 pre-orders for their 2TH mining rigs, we saw them weeks postponed from original promised date, and with all of them under-clocking at just 1.7TH at BEST!
Couple this trend, that of mining companies falling far below expectation, even farther behind promised schedule, being "new" seems like a fairy tale all things considered --- with the knowledge that every single miner is "tested" before it is shipped it's not hard to see why they have consistently sucked.
Tera chose to ship their models, at a time where bitcoin's $ value was decreasing steadily. Perhaps if it had not been dealt a huge blow at the hands of Gox, they would have withheld shipments for several more weeks. Perhaps they would not ship out at all if they price again skyrocketed to $2000.
It is somewhat scary to think that all of these channels are dirtied with the stain of avarice, corrupted absolutely by cut throat companies who are almost never releasing anything earth shattering without getting their own bang out of the product first.
The bitcoin market and it's miners are forever inextricably linked due to their necessity in confirming transactions, in securing the network. The ties between them are tainted unfortunately.
I can't imagine any really profitable mining equipment being sold ... at all ... until key measures are put in place to level the mining field.