<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Karen2:
I think there is little damage done getting the cards for miles and dumping them.</font>
There is if you do it frequently. Every time you apply for credit (either from a loan or a credit card) they do a credit check (I think they're called incidents, or something like that). If you have a number of these over a short period of time, your FICO score will definitely take a hit.