[Shoe]

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If it is 15X then it's just not worth it if you have RB and 4-table 3-6 or higher. (Should be on par with 3-6).

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If your talking about rakeback on empire, then any empire bonus is worth it, as the bonus pays you 100% of your MGR for that amount, and you get rakeback on any MGR you generate after that while clearing the bonus.

If your talking about rakeback at a different site, then eventually you'll reach a point where rakeback at site x is better than a reload that takes a long time to clear.