That's what I'm doing (no joke). I have three R9 270X listed on eBay with a starting bid of $199.99 (I hope to get around $205-$230 each).  After eBay fees, paypal fees and free shipping I'm likely going to take a $40-70 loss per video card (excluding anything I mined). That being said I'll keep mining here with my last video card a R9 290.