Why can't I start my MacBook 5,2 in 64-bit mode?

I've checked: The processor is of x86_64 architecture (Core 2 Duo, 2.13Ghz). I've tried holding 6 and 4 while booting. I've tried the command line route. I've tried Startup Mode Selector. Nothing works. In fact, Startup Mode Selector says that, while my processor is technically capable of supporting 64-bit mode, Apple doesn't support it.
What gives, and is there a hack around this?

Follow up info:
I'm running Snow Leopard (10.6.8). I need to run Windows under VirtualBox, but VBox will only recognize all my RAM (6 GB) if I boot into 64-bit mode. I have to throttle the RAM available to VBox back to 2048 MB to keep it from misreading host memory levels and aborting.
Follow up question:
If I upgrade to Lion, will it boot to 64-bit by default with my hardware, or no?

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Why can't I start my MacBook 5,2 in 64-bit mode?

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