Personally I think that's just a sad practice. Don't take them from someone who might actually be interested in the first place then.
I used to be kind of angry at Licurg for doing that, but ... Why? If he opts to trade, Licurg will be happy that he got a game he wanted, person he traded with will be happy that he got rid of a game he didn't want and ... well got one he did, everybody's happy.
I can understand why some people would object to what Licurg is doing, because he is profiting from someone else's generosity (he gets a game with zero value to him and uses it to get a game that does have value to him).
But seeing as he asks before accepting anything (or has started to?) then there shouldn't be a problem because the gifter is both aware and okay with it.