thisiszen
We've noticed that every time we stopped the ads, or changed the targeting parameters/audience, it would take a while for Facebook to get back to the same results.
p.s The lead cost was that high because we were selling $200k land + $500k houses from a small tropical country to US consumers that may have never even heard of that country.
Last week the T-Mobile CMO announced a nationwide campaign in which existing and new customers could turn in any Blackberry and get $200 towards a new phone (it was a response in regards to the CEO of Blackberry blasting them the day before).
I had just switched over to T-Mobile a couple of days before (so that I can upgrade phones whenever I want with their Jump program) and gotten $0 for my Blackberry. Usually I don't bother but this time I wanted to carry out an experiment on T-Mobile's customer service and see if I could get them to retroactively honor the Blackberry deal.
Long story short, I twitted their CMO (I'm nobody on Twitter) and he got back to me within 30 minutes. The next day I got a call from T-Mobile's corporate that my account had $200 in credit!
Now, I'm their number one fan.