Need FAAB advice

So someone just dropped Duke in a pretty deep 12 team .5 PPR. Our waiver wire is ALWAYS slim pickins and Im pretty thin at RB, how much FAAB should I throw down to claim him? Currently I have $14 on him right now with 69 left. Waivers go through friday.

Thanks!

WG7

bumpin dis up

Does no one play with FAAB?