Would this be a benefit for building credit?

if somebody has great redit, and would like to increase the amount a bank will loan them it seems like it would make sence to take out loans for a certain amount, repay them faster than needed, than take loans out for more large amounts and repeat. of course building credit this way is not free you would have to pay the interest on the funds loaned to you, but to me that seems like a small cost of getting a better credit limit. how much could somebody build their creidt up to? What I Mean by that is can someone with a low paying job but with spotless credit get to a level where they could borrow like 100 grand even if there income is only say 30 k a year, based on the strength of their credit history?

To a certain extent it makes sense. Bankers want to see a track record of repaying debt on time, over time. But they are also going to use some tool to measure your capacity to repay the loan when they decide how much to lend you. So no, you're not going to be able to borrower $100,000 in most cases, if you do not have the income or other resources to repay the debt. And why would you want to, any way?

If you were a credit card company would you give a 100k credit line to someone with 30k salary? Neither would they. Do the research on ftc.gov The federal trade commission has a ton of information on credit.

When it comes to borwwing large sums of money ..income is an always will be the most important factor in how much a bank will lend you. Its the best insurance policy for the bank. Sure havnig great credit helps--but it doesnt guarentee them you will have the money to pay them back.

Even with a 800 + plus credit score the bank is not going to just blindly lend you more money then you can afford to deal with. No bank would give an unsecured personal 100k loan to someone who makes 30k. They will definitly give you a mortgage of that amount or more though. What they will do is lend you the amount of money you can afford at excellent interest rates. Thats how having a good credit score can help you. Income is still the most important factor when it comes to how much money you will be lent.