Ethical Dilemma

Hi;
I live in the US Virgin Islands. Jewelry is big out here. On a trip to St. 
Thomas, I ended up signing my first TWO jewelers. They're direct 
competitors, of course. Neither of them knows about the other. Each has 
purchased the exact same package. I've just started developing their sites. 
The artwork, of course, is different, but the navigation is almost 
identical. After all, I have one brain and one best idea for navigation in 
their business. Besides, if I did it any other way, once finished they'd 
each complain that the other's navigation was superior. They've also each 
purchased usability studies. Now, it doesn't seem reasonable to me to 
repeat virtually the same study for each of them. Besides, they'd both 
suggest I'd double-charged them. So it seems reasonable to break the news 
to them both concerning the situation, and suggest I give them double their 
money on the usability studies (two for the price of one). Ain't I a lucky 
guy. Suggestions?
TIA,
beno 

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