BMX is not something that I know and don't really have the inclination to learn. It is bad enough that I have a boat load of cruisers (middle and heavy weight) that I am slowly selling my way through. They are another area that holds little personal interest -- I only like the bikes that I can ride or are like the bikes I can ride.
Of course, the cruisers are the only ones that have ever come up as buy this pile of 30 or 20 bikes for one low price. Oh, and then figure out a way to get them all home.