Why Americans living abroad renounce their citizenship

I thought this was interesting.  It asks those who were American citizens but who were living abroad and renounced their US citizenship - why?   It seems alot of the comments are related to difficulties of living abroad while trying to comply with complicated U.S. tax filing laws that make it very difficult to live/work overseas.  Some also comment that overseas banks don't even want to deal with them due to all the complications.  Many don't seem to want to do it - but they seem to say it's financially too difficult to maintain.

Anyhow, I thought this BBC article was good reading:   Why I gave up my US passport