"Reasonable rate" is subjective and relative. What is "reasonable" to you may not be to me and vice-versa. The real issue comes down to costs of items that can be purchased with Astral Diamonds: the AH is flexible but vendor items are not. If one compares the rate at which the average player can earn AD as compared to the cost of vendor items: vendor items are ridiculously and grossly overpriced beyond sanity.
Unfortunately: The answer to your query is likely not a "no", but more a "hell, no."
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Unfortunately: The answer to your query is likely not a "no", but more a "hell, no."