First of all may we know why you are selling these accounts? These accounts are related to any Bitcointalk accounts and you used un Bounties?..
Twitter 20K followers - 60$
I think rate is not bad if followers are real
Twitter 2011-2013 ( 50-250 followers ) - 20$
50-250 followers gain is not hard anyone can get by working 2-3 days.
youtube channel 1K+ subscribers - 100$
I think rate is very high . if it monetized then ok but for non monetize channel the price is huge. The price should be 20-30$
I recommend all buyers to use escrow members to avoid scam and fraud. Thanks
Bitcointalk Escrow lists