Just checked AA.com for our next dates. Looks like the cheap flight to STT (with a stop) from BWI is $505 round trip. Looks like flying Southwest BWI-SJU non-stop for us should be about $345 rt, plus another, let's just call it $300, from SJU-EIS. So, we're paying an extra $140 (before factoring in ferries, cabs, fees, tips) per person and chopping probably 3-4 hours off our travel day.

I guess it all depends on where you are flying from and what factors are important for you. For me, I am not "there" and relaxed until I am "there". And I especially don't enjoy standing in a hot, cramped line with people pushing and shoving waiting to clear customs. If you asked me while standing in that line if I would pay $200 to go straight to the front of the line, I'd hand you my wallet and say "take what you think is fair"!

To each their own! I'm glad people prefer flying in to STT. If everyone did fly into EIS, my tickets would just cost more.