I suppose this could work if you worked out a way for your server or whatever to recognize the current line for a specific bet at Pinny and then automatically update your line plus whatever amount of juice you add to the top. It could work, but small profit margins unless you are taking some BIG action, in my opinion.
Nobody is going to post up with an unknown bookie. So, you will have to give out credit to get business. And then you will have laydowns. The problem with a laydown is that when your bet loses , you have to pay Pinnacle with money that never gets paid and you are screwed.If the money is actually in Pinnacle, what's it matter what they put down? They want to put down 10K at -109, you make the play at Pinny (or you don't), and relay the results back.