We are about to book the flight for our family vacation to Disney World in September. Looking at the prices on SouthWest I can pay about 759$ for 3 roundtrip tickets. If i'm using points it shows it would be 41,580 points. They sell the points at .01$ each. Meaning i could pay 420$ and purchase 42,000 points and cover the entire flight. Am i missing a "catch" here?