Ha ha, amazing how many bassists have said that, only because it has the magic logo I suspect.
Does it make a difference, well scientifically it must because everything does (and I doubt it does any harm). In practice however I doubt it makes a whole lot in terms of temperature/humidity regulation, I use it more for two things, protects the board from knocks at gigs and tends to discourage the "Just gonna have a quick play on your guitar" type punter also.
While the sock makes little difference though, I expect the case the bass is stored in can. A decent model like SKB will probably offer far more resistance to changes in humidity and temperature than some of the cheaper brands. I use SKB for my studio gear and it's a different league, expensive, but then so are basses and studio gear π