I think it is a terrible idea.That is another way to turn people off from this site.I know some profiles have not been active for a while,but so what? There are a lot of people that don't spend a lot of time on CR,but check in once in a while.I for once would not come back if my profile was deleted due to not being active for even a long period of time.Sometimes "life happens",or interest fade and people take some time off ,but this is no reason to delete their profiles.It's like saying "you're not active enough,we don't want you here".As far as people creating profiles to benefit from referrals,well this is going to happen as long as there rewards for that kind of contests.I still believe this is a great forum with a lot of knowledgeable members,where you can get a great advice you seek,being able to connect with other hobbyists, and also a great place to buy or sell reef related stuff,so just for those reasons people should be referring new members,so this forum can expend and not just for a reward.I referred a few people here and I don't even ask them to put me as referral when they sign up.I am happy that they are here and we can share our success or failures and to learn from each other.
