how much could i make a week in private advertising if i had 20k impressions a day?

right now my site is slowly gaining more members, i don’t expect to earn a ton of money off adsense, however i do expect to gain money via private advertising
so i was curious, what type of price would i be able to charge for lets say a banner at the top of my page if i was getting 20k impressions a day? how bout 80k?

See original post by nuthin2lose