My New Cork Pen .. Am I helping?

This weekend I received a beautiful roller ball pen that is made from real cork.  It's like the one in this photo except its cork instead of bamboo (apparently mine isn't on their site for some reason)  It is beautiful, writes awesome & they donate a percentage of the sale to save the rainforest.  Which later made me think of the irony.  Donating a percentage to replace what they cut down to make my pen?  Althought I've been told cork is an extremely renewable resource that grows quickly hopefully.....