Being an OFW is a gamble in someways. Most people go outside the Philippines for the very reason of earning more or to at least give their selves and families a better life. The exchange rate is fluctuating and sometimes it really goes down. That's a big hit on the OFWs part since aside from being so far from their families and loved ones, they're not earning as what they expect (the least).
Foreign companies are also abound in the Philippines and they offer very good pays. Sometimes most people just don't see the opportunity or miss out some pieces in weighing out things. Sometimes working here in the Philippines is just as good or even better than working abroad salary-wise.