Trying to turn someone vampire for gold

Already sold, word of advice if someone tries to scam you record it and report it ingame

Could one of you turn me into a vampire for 5000 gold?

Just so you know, you can flip from being a Werewolf to being a Vampire Lord and back again. In my DG playthrough I went from being a werewolf to being a vampire, back to being a werewolf (got the Werewolf Mastered achievement), then had a certain someone
turn me back into a vampire so I could do the Vampire Mastered achievement, all while being with the Dawnguard.

Those creatures are they're called Vampire Lords and there a transformation for Vampires similar to being a Werewolf except from what I've gathered you can turn into a Vampire Lord and turn back into a normal Vampire at will instead of waiting around to
turn back to human as a Werewolf.

Assuming your in Vampire Lord form, you only physically "feed" when you either perform a life drain spell or when you bite someone. And you can't bite anyone unless its a last chunk of their health thing: mostly like when your in werewolf and you pounce
on someone to maul their face off.

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Cure it? I don't understand what you're trying to do there/why.

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Its sounds to me like you haven't made it to the part where Harkon gives you the Vampire Lord ability. Until then, you still harbor the traditional vampire genes. Its not until you are turned into a "pure blood" that you gain the ability to feed