There are more international bowlers around the world who bowl seam than swing or spin,

One reason is seam bowling is very dangerous for batsmen because they cannot "read it".

In fact, not even the bowler knows whether the ball will go left, right or straight once it hits the pitch.

A batsman can read a ball swinging in the air or a ball spinning or cutting off the wicket but can't read a ball seaming off the wicket.

A seamer who is accurate on a pitch offering lateral movement is a dangerous proposition..