La Jolla Renter
This strategy does not work aswell these days because they now charge 3% for balance transfers. Additonally you would not wnat to open 4 card at the same time because you would use up all the good ones. A better idea would be to stagger your credit card openings. Open up 1 with lets say 20K. Use it for 9 months and the final 3 make large payments to get this to 0. Next years comes do the same thing.
The only downside to this from a credit standpoint is utilization. Once you get past 30 % utilization on your CC you will see a drop of about 15 to 20 points if you are starting out at 800. Big deal. Now you are 780. You still qualify for preferred loan rates.