Oh sure, like you can just do that if you're out of money. (/sarcasm) It costs money and time to get a passport, fly out, have a destination that will accept you, figure out security for yourself, etc. Plus, you're making it harder for the existing people there to keep prices low.
If you have a bunch of money lying around, sure. But most people are pretty decently in debt or at best just outright poor when they run into issues like that.