There was no cost to renounce U.S. citizenship until July 2010, at which time a fee of $450 was established. In September 2015, the U.S. State Department raised the fee to renounce U.S. citizenship by over 400 percent. The cost was increased from $450 to $2,350 in an effort to deter Americans overseas from renouncing citizenship.
Thanks again, Obama.
For the same reason the Berlin Wall existed. Make it hard for the slaves to lease the plantation.