Expensive vodka for vanilla extract?

D. asks:

Should I use expensive vodka when making vanilla extract? Does the quality of alcohol in vanilla extract matter?

I think the quality of the alcohol is probably unimportant. Such a minor amount of the vodka is used per serving that it won't contribute flavors to your food. I use the cheapest vodka available that is at least 40% alcohol/80 proof.

This is just my opinion, please share your thoughts in the comments.