Keep the ones you like.
Most of the IDW stuff is not worth more than the paper it is printed on, due to the high volume of collections, plus the online versions (apps and otherwise).
You might get a little more from bundling earlier IDW run comics (stormbringer, Hearts of Steel) together into complete sets. It could all change on if there is some renewed interest/new interest when IDw goes into their 2 series run for their older stuff, but since the furmanverse comics bear so little relation to the current issues, who knows!
I think it will all come down to luck, as in who is looking at the time you put them up for sale.
Looking For: Wreckers Saga TPB Collection (with Requiem)