If that's what it takes then so be it. Best to know early on than years down the line. I actually think it's vital to know 100% that she loves you before thinking about marriage. And it doesn't matter what she says as this has about as much value as a Yum Burger from Jollibee's. Talk is cheap.
Of course, there are Pinay's out there who want a man for all the right reasons. I know a few here in the U.K. They're the type who don't mind going out to work to support their family in the Phils and don't expect their husbands to shoulder the burden.
And let's be clear about scammers. They come from all corners of the globe including Britain. Any woman who marries a man for financial reasons is a scammer in my eyes, regardless of their nationality.