The difference between the OTCBB (formerly owned by FINRA) and the OTCQB (owned by OTC Markets) is an additional $3000 filing fee and a choice to duel list....nothing more than that.
The OTCBB is under a sales contract, with a large securities firm, to become the new NASDAQ OMX BX (www.bxventure.com) .... but this is not yet fully completed and is not expected to be completed until Q3 or Q4 of 2012.
There are very few companies solely listed on the OTCBB ... as most liquidity has shifted at this level to the OTCQB and thus many companies duel list....and again....many do not.
Beyond this, OTCQB companies begin qualification to the OTCQX, which has the same listing requirements (no Sarbanes-Oxley) as does any National Trading Board but does not have the stringent share price requirement that they do.
Please do not disrupt the class again with misinformation.