Were the Pure-Blood wizarding families incestuous, /lit/ ?

They were redpilled as fuck, if that's what you mean.

>>9144192
True

did snape die a virgin?

>>9144257
He died a cuck, forever saving hisself for Lily

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>>9144097
Of course. Most of the "incest" was kept in the old pureblood families such as the Blacks and Malfoys. In fact, "incest" was used two ways. The first was to keep the bloodline pure and unsullied by Muggles. The second was to keep the wealth and power in the family. This second reason has justification/precedents in the royal families of Muggle Europe.
As Sirius pointed out in OOTP, all purebloods are related to each other. Thus, if a witch or wizard wants to marry a pureblood, they have very limited choice, and must marry a relative.
Muggle-borns and half-bloods find such families disgusting and backwards, but for the purebloods, it is a fact of life. Such incest has been going on for so long in these families that they don't know or want to live any other way.