How funny you should mention that--we have had very similar experiences.
On that trip to the Bahamas we were separated into groups that went to different area churches to assists them with their Vacation Bible School programs. So many kids showed up--it was amazing! On Sunday morning each group attended their "home" church's worship service. There was a sign on the wall that showed the previous week's attendance and total tithe received. It said $87 was received the previous week, and it wasn't because these people weren't faithful givers. When the pastor announced that it was offering time that Sunday, the church members erupted in applause. They showed me what it means to be a joyful giver, and I asked the Lord to give me the same joy and convinction when tithing. I am happy to say that God blessed me with true happiness when I tithe, and it's a settled issue as far as I'm concerned. If those who have nothing can give joyfully, then I, who am blessed beyond words, can give joyfully too. I think this is what Jesus meant when He said that the last shall be first and the first shall be last--those people set such a wonderful example.