Ruka isn't trying to buy Hayate off. She's simply being what the manga has described her as. A very earnest and straightforward girl. "Hayate can't date because he has to concentrate on paying back his debt? No problem, I will help him pay off the debt with all my might" It's not because she thinks this will automatically win her Hayate.
Plus we all know Hayate rejected every girl so he can be with Athena in the end ;p
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