The general problem with moving on the dross players Wenger picks up, is not lack of interest, but Wenger deciding the players are great, could be used and putting silly prices on them. We had interest and afaik, a few offers for Chamakh in the past few years but Wenger decides that say sub £5mil for Chamakh is not enough and we may as well keep him around as backup.... even if we don't use him and could buy someone else as backup he might actually use.
We've supposedly received quite a number of offers for Bendtner but Wenger has been looking for £8mil + because he thinks he's quite good, yet he's a player not being used at all, and clubs who could buy him can find cheaper options that are as big a risk.
Same goes for Santos, Denilson, Arshavin, and probably plenty of others over the years. Thats my worry over interest in Gervinho, that Wenger won't admit he was wrong about the player and decides he wants to keep him unless the fee is big enough that its worth getting rid of them. IE we sold RVP/Nasri because the fees were too big to turn down, and he thinks the same about the rest....