Here is what I like to do to double my click pleasure:
1) Develop the site into a simple one pager "this site is for sale type" website.
2) Add some google adsense to it
3) Throw in a couple links to some of your other sites to possibly get them some more exposure.
4) Add a "visit here to make an offer" type link and have that go to your sedo parking page.
Doing these things can double your click performance and advertise your other sites a little, maximizing your parking potential with little to no maintenance.
Example of one of mine is
www.ToutForum.com
Good luck and let me know your thoughts