I don't think it's unprofessional at all. From what I've seen, the quality of your work is always very high and you certainly give people good value for their money. To me that constitutes professionalism.
However I would imagine that these $10 items are preventing you from getting any of the higher priced charcoal orders. Once the busy season rolls around I also wonder if people who saw your $10 product will feel that the $45 item is not such a good deal any more. This lower priced product may seriously undercut your position in the marketplace.
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