That way, you can find what messaging works best as early as possible. A 3rd party javascript A/B tester is phenomenal for the types of tests where it'll work, as you can easily tweak and see results without changing any of the underlying website code.
Also, I like the "treasure map" phrasing, makes it sound romantic and interesting! Maybe you can work that a little more thematically into the design? Rather than simple white box, it could be on a scroll, or maybe the background could be a bed of gold coins. Something like that. (Again, not a designer, so take those suggestions with a grain of salt...)