Why should I consider trading?

(x)
MP4 (Source) 900 x 720 23.64 MB
FLV (Flash) 900 x 720 21.76 MB
FLV (FlashHD) 900 x 720 21.97 MB
MP4 (480p) 600 x 480 14.14 MB
MP4 (720p) 900 x 720 22.96 MB
3GP 225 x 180 4.82 MB