Sending money to your loved ones in the Phils. is such a nice generous act. But to how much is a thing you and only you can determine unless you have lots of extra funds to waste that you wouldn't even bother and won't even mind to ask where will the money go and where will it be used.
I know it would take LOTS of TRUST and LOVE for a guy to send some of his earnings to a filipina who is thousands of miles away from him. Some guys may have that trust and love in their hearts but still hesitate to send money maybe because of a bad experience.
I'd say that every filipina, whatever her motives is, will always appreciate her bf's generosity. Getting to experience a better life because of you sharing a part of your blessings will always be appreciated by your partner. Sadly though, some filipinas abuse this generosity.