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system
passing money through a different account to avoid cash pay-in fees
user
let me do the math. .6% * (not large) = really tiny. since "not large" = "small" , etc.  i suggest that even a small chance that you need to explain this to anyone in the future is a sign to avoid the risk. yes, there are times that it's illegal. a real estate office may not deposit escrow funds into anything but a segregated escrow account.  in your case, even if legal, it messes up 'the books' and can cost you more in grief than the 'tiny amount' saves you in cash.
assistant