No difference b/w a flat fee ot a % if that is your question. Compensation can be in Gazoos or lightbulbs or dollars.
Is it legal? Consult an attorney. Is it wise? I say no. What are you going to do for your fee? Do you know what you are doing? Who are they going to blame when things go wrong, and they will. Who do you work for? If the buyer and seller go different ways, will you still be able to be on good terms with them? Things for you to consider.
Edited by Doin' bpose (11/15/09 08:31 PM)
Edit Reason: added thought.
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Life's not fair.