Good point, but if I was traveling by myself and in that case I would take the guagua (even if I have to crash a cabana for a few hours), that is if I don't have a friend pick me up.
BUT if I drag my tribe with me (these kids are clingy I tell you) that would be 225*3= 675+150= $820 through the capital where as 3*400=1200+60=1260 (ouch!)
Also, I tend to use SDQ because of FF miles too, much prefer JetBlue over Delta, but JB miles are useless outside caribbean & Mexico.