The reason being is that it penailzes the 1 seed by denying him bonus team points for pin, tech fall, or a major decision. All he would pick up would be his 2 advancement points. Rule 10-3-3.....when byes are required for the first round, they shall be placed by mutual consent or drawn so that they are distributed evenly throughout the bracket.....
By rule, it would be possible to mutually agree in the seeding meeting that the high seeds be given byes, but most coaches want the bonus points that they can pick up.