In the past I have bought plenty of woothemes subscriptions to keep. The 15 licenses for the themes, extensions and plug ins. Then they expire you find you can’t download the products and a lot of other problems. I find that unless you have plenty of customers that you need the licenses you don’t want to be buying a lot of these licenses before hand then you also need to maintain them after the licenses expire means that you need to pay to renew them.
Also you can see how they are reviewing woothemes here.
This is another post that is talking a lot more in depth about woothemes