Sales were actually pretty reasonable, according to all sources.
But an increased budget would've probably made additional installments unprofitable. Even with reasonable sales, would the increased production budget cause an equal uptick in sales?
Of course, this is all speculation. Personally, I have heavy doubts that the model that the OP proposes could be sustained at all--there's just too much free programming on TV, as well as dirt cheap programming on Netflix and cable, to attract a large enough customer base to fund a new STAR TREK series. The Straight-to-DVD route might be more viable, but there hasn't been any indication that it would be sustainable.
Guess I'm spoiled... but I don't want Star Trek
done on the cheap.