I don’t know either if this is an issue or not. (If people invent new usages, that may be interesting).
But, I would however recommend to be cautious and to investigate a bit.
And preferably avoid doing many of such transactions if things are not well understood and if you have doubts.
If the offers are too good (is it the case ?), this may be a warning bell.
When the DAO will be released, the contributors will have to vote on the reimbursement demands.
A user who has been scammed N times by a same onion may perhaps have some difficulties to be reimbursed for the whole batch.