Yes, you are free to re-sell your DreamHost hosting at whatever price you wish.
The DreamHost panel allows you to create new WEBIDs (panel log-ins) and restrict the panel privileges of these WEBIDs, but the overall re-seller process is not as intuitive as some of the alternatives.
Do you mean can you re-brand the panel? If this is what you mean, then no you can not.
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