Bates had six birdies and one bogey to win for the fourth time in his career and the second time this season. He captured the Siouxland Open in July by one shot over Matt Kuchar and Eric Meeks.
The 32-year-old began his round one stroke behind third-round leader Kamm. He dropped a shot with a bogey on the par-4 2nd but responded with three birdies to make the turn at minus-17 and build a one-shot lead over Kamm.
Bates made the first of three consecutive birdies on the par-4 12th, while Kamm added a birdie of his own on the same hole.
Kamm added birdies on Nos. 14 and 16 but failed to tie Bates and force a playoff managing only pars on the final two holes.
The Shreveport Open was the last event on the Buy.Com schedule before the top-55 on the Tour's money list will compete at the Tour Championship at the Capitol Hill Golf Facility in Alabama.
Bates, who came into the tournament ranked ninth on the money list, was among those who had already guaranteed their presence at next week's event but many players needed strong finishes to secure their spots.
'I tried not to think about the money list all year and just try to put myself in position,' said Bates.
Kamm was 55th heading into the weekend. His best finish since the 1997 Shreveport Open moved him to 29th on the money list and solidified his opportunity to play in the Tour Championship.
Don Reese fired a 65 to move to 17-under 271 and climb to 55th on the Tour's money list. He finished alongside Stiles Mitchell (66) and with the third-place finish, bumped Jay Hobby out of next week's field.
Jason Caron posted a 68 to finish alone in fifth at 16-under 272, one strokes ahead of Keoke Cotner (68), Bruce Vaughan (68), and Billy Judah (69).
Brian Claar carded a 71 to finish at 14-under 274, two ahead of Fran Quinn (69).
Chad Campbell, the Tour's money leader was not on hand as he was part of the field at the PGA Tour's event at the Walt Disney Resort.
Click Here for Full Field Scores from the Buy.Com Shreveport Open.
Click Here for the Current Money List and Full Stats From the Buy.Com Tour.