First, I would not park them with godaddy. There are far better ways to park a domain with other parking companies who you don't have to pay to park.
Do you really need to develop those domains?
Consider that by owning them you are keeping them out if the hands of competitors and affiliates.
I would not develop a domain unless you feel you have enough content to warrant a domain and a whole new site. If it is just for certain products then you might be better off just redirecting them. You wouldn't want a bunch of doorway domains with little content on them pointing to your current site.