I tend to agree that Narcissa probably was more interested in Lucius than Bella was in Rudolphus-she stuck with him, after all, rather than deserting him or lusting after Voldemort. But there was probably still a fair bit of pressure on her to tow the Toujours Pur line-rather than get zapped off the tapestry like Andromeda.
I'm just trying to think of how she could have safely extricated herself and Draco once Voldemort returned. I don't think we learn what her opinion of Voldemort was when he first came to power. I am guessing that she probably enjoyed the prestige of being married to a Death Eater in Voldemort's inner circle, but I doubt she took part in any of the bloodshed. She just doesn't seem the type to exert herself unless there is a direct threat to her.
For all we know, when Voldemort disappeared, she might have been very relieved. After Voldey returned, how could she make her escape without bringing more disaster to her family?
Lily did choose to kick Snape loose because of the company he was keeping and his attraction to the Dark Arts, but at that point, the only thing she was giving up was her friendship with Snape-Narcissa could have brought death to her husband and son if she had tried to turn away from Voldemort. Since Lily had been brought up by Muggles, she wouldn't have had the whole pureblood thing drummed into her head in childhood as Narcissa did, so it's not surprising they had different reactions.
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We know that Bellatrix married Rudolphus for the pureblood reason -- there was no love in that marriage according to JKR.
But Lucius had a lot more going for him, I think... he was rich, he was intelligent, he was ambitious and probably reasonably good looking... and Narcissa was beautiful so they both probably could afford to be choosy over whom they married...
I'm thinking that they married because of mutual attraction...
