It would probably only affect your PR not the sandbox variable that got you there in the first place. The only way you can get out from the SB, as far as I know, is to reach the amount of time Google sets for you to be in. If you removed the links you would still be there for the amount of time originally intended, plus you may loose PR.
Nobody knows this forsure! Just my experience!
Wait and think about Adwords if you NEED Google traffic!