Airwolf
First Post
I have to agree with Nebulous, keep Sense Motive.  I think Neb is also right in that it should be vague.  When I have had PCs use SM I have responded with things like “personal gain”.  This worked great when they were working with a black market merchant that was working to gain their trust to rip them off.  
I’m sure I could have said “he’s trying to rip you off” but it would cause the game to bog down into lots of SM and bluff rolls.
It takes some thinking but I’m sure you’ll be able to come up with responses when the NPC fails his/her bluff check that won’t ruin the game.
Good Luck
				
			I’m sure I could have said “he’s trying to rip you off” but it would cause the game to bog down into lots of SM and bluff rolls.
It takes some thinking but I’m sure you’ll be able to come up with responses when the NPC fails his/her bluff check that won’t ruin the game.
Good Luck