There are many people who have unused domain names which were earlier used for running proxies. Many of the domain names are .info How much parking revenue do you earn from the domain names lying unused now and which were earlier used for running proxies??
People wil rarely give information which is really useful.. I have found that previously used but presently parked proxy domains do give you some clicks.. you do make money from them...
How big is my house? Pretty random question how do you expect to get an answer like that! Give it ago and try.