your credit score is created from how many open debts you have, how long they been opened, and how up to date you are with your payments..if you buy something for $300 and completely pay it off the first month you get your bill..you have no track record..they look at it like this guy just came into some money and paid us off..but you have to prove you can do it continually over a long period of time..thats how you build trust with them and they can give you a higher limit and even upgrades to gold and platinum..if you paid it off at one time..where is the proof you can keep doing that? they dont know that you can..what they are going to wait for you to buy something big again? your not going to be buying expensive shit like that every week or month..thats how you build your credit..espcially if your a ghost, thats what lenders call people with no credit history..apply for a loan for around $500 even if you dont need it..and pay a few dollars over the minimum..so start creating a paper trail of your credit history..if you dont believe me watch susie orman