I did swallow my doubt and buy Civ V, but did not buy any DLC nor pre-order for bonus content nor get the deluxe version.
I have been seriously disappointed with the game, and continue to be, and am even more disappointed at the arrogance of Firaxis at seemingly laughing at the large number of customers who did buy the game and have not been satisfied. Contrast firmly with Stardock, and their CEO Brad Wardell who acknowledged Elemental was not what was promised to customers and not only did Stardock work diligently to fix the game with patches that not only addressed the launch issues but almost remade the game entirely, but in a gracious and courteous apology to Stardock's customers is giving away two full, entire expansions (the first of which will be stand-alone and not even require the original game) to every customer who had bought the game before it had been made ship-shape.
Just compare and contrast the two -- a trickling of half-assed patches from Firaxis, no real acknowledgment that the game was a step down from previous versions, buggy and bloated running slowly in late turns even on high end machines, terrible AI, etc., and certainly no courtesy to its paying customers ... instead just continuing to steamroll ahead with premium DLCs.
No way would I buy any DLC. I have never felt so let-down by the Civ V franchise before ... I've been an adoring fan since the very first Civ V game and even at launch day, have not had any serious qualms with any of the Civ games with the exception of Colonization (no, I don't have a console so I never tried Civ Rev).
I am curious how many, like me, have not been sufficiently impressed with Civ V to pay extra money for DLC. versus the die-hard fans who think the DLC is appealing enough to buy.