Why do BMX bikers rest their bikes upside down?

Question

I've seen this a lot when the bikers aren't riding and I don't know if it's just a trend or if it actually helps maintain the bike.

Answer 1

Well first of all they have no kickstand and plus after theyre

done riding they usually check theyre bike to make sure everythings

still tight and working good. At least thats what people with good

bikes who are good do. lol =)  

Answer 2

because they don't have kick stands.

Answer 3

Probably because there are no kickstands on nice BMX bikes(or any nice bike), so that's the easiest way to make them stay up.