Ok,
This is a rather unethical thing to do. And if you are caught trying to pull off this stunt.... well.... say goodbye to your money and your fingers. At least around where I play anyway.
Now, having 3 people work a table is overkill. Having 2 people work it can be done. And yes, it can be profitable in the short term. You may get it to work for one session for sure, two sessions is slim and then you can kiss all your action goodbye as people will wise up to it.
Now, it is VERY tough to conceal. At the higher limit tables people playing there are smart enough to know when they are being had. At the lower limit tables... well... is it worth the risk of being caught and banned from the casino for an extra $6 bet?
highly doubt it.
Trying to pull off a stunt like this is ludicrous, unethical, and just plain dumb... and potentailly painful.