The belief seems to be that the nations of OPEC need the money that oil provides as badly as we need the oil.

Which is true.  Look at the demographics of virtually any major oil producer.

The only exceptions would be the Gulf States (ex Saudi Arabia) and they are struggling to build a 'post oil' infrastructure eg Dubai, Abu Dhabi as their native supplies deplete.  True even of Kuwait.

Iran, (Iraq), KSA, Nigeria, Venezuela all have high birth rates, high percentages of the population under 21, massive unemployment.  They have no choice but to pump oil.
Russia runs the central government on oil revenues, so does Alberta and Norway.

This is also true for most of the minor oil producers.

Funny, I seem to remember a whole bunch of cattle and canola in Alberta from the last time I was there. The last I heard the oil companies are paying almost nothing in taxes. I think the royalty on tar sands oil is 1% until they've paid for the cost of building the extraction plants.
It's true that they cannot stop selling oil, but I disagree with the market's disregard for the OPEC production cuts.  It doesn't take a genius to realize that it's better to sell less oil for a higher price than more oil for a lower price.  In other words, their need for money is not a good argument that they cannot cut back on production, since if it's done right the end result should be the same revenue for less oil.