Wood racks and humidity

I'm thinking about upgrading my rack and like the appearance of the Butcher Block Acoustics and some of the Timbernation products. My system resides in a basement, where humidity in summer sometimes reaches 60 percent. I have a dehumidifier, which I run as needed. The previous owner of my house was a musician in a symphony, and he successfully stored sheet music in the basement here, with the aid of dehumidifiers.
The Butcher Block Acoustics website cautions that their racks should be in environments where humidity remains in the 35 to 45 percent range.
Does anyone here have experience with wood racks and higher than recommended humidities? Am I asking for trouble by buying a wood rack rather than something with metal posts and MDF shelves? I expect to move in the future, and a wood rack would look better with other furniture as part of a setup in a room of the house rather than in a basement. For the foreseeable future, the stereo will remain in the basement.