The Blue Jay's payroll for this year is around $138 million. That's in the top half of the league in spend, sure, but it's hardly obscene money. Heavy spenders like the Dodgers ($318 million) and the Yankees ($219 million) are on another level.
http://www.spotrac.com/mlb/payroll/
If you're Houston's front office, you're just excited you're in the playoffs this year. Their rebuild wasn't supposed to be finished for another year or two yet, but all of their young players have started performing early. And I'm sure 5 or so years down the road, the Astros will become big spenders as they try to retain a lot of their developed talent and bring in big free agents to patch over the holes.