1. Keep your whois information for all fields.
2. Do not let leased party control your domain.
3. never trust your leased party when it comes to domains.
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Maybe you should look into putting them to work in the 'pay per click' game. Lots of people try to just make enough money to pay for their registrations that way, allowing them to justify owning them and at the same time, any traffic you build in the process is always a plus.
Much better than worrying about everything... 'Leasing them' could turn into 'buying problems' in a heartbeat.