CMKM Diamonds Inc (fka CMKX)

[matrix]

Has there ever been a company who pulled themselves out of the OTCBB?

Yes, here's a list for the last year. N/A = AMEX
lhttp://www.otcbb.com/dynamic/tradingdata/daily/graduations.htm


How about a company who pulled themselves out of the Pinks?

Yes, you can find some here.
http://www.pinksheets.com/marketactivity/venue_changes.jsp

Companies which file bankruptcy usually fall into the pinks until they reorganize and reapply for BB/exchange listing. Pinksheets is not just trash stocks. They quote securities for a number of banks, trusts, ADRs, and bonds.