Matt, One Casino Host me some useful advice a few years ago. I believe that he was being upfront with me, as I've stayed at their Casino for 20+ years annually. He advised that those who take Casino Credit are going to lose. The House Advantage and negative expectation gaming can only mean losses for the player in the longer term, but of course we all know this. He suggested that I only play with the money I bring to the holiday/convention. The facts that the cashpoint (ATM) withdrawals are limited for your cards also puts protection on your own money. I'm sure all of us have been there...tapped out...card maxed out for the 24 hour period, and you're in limbo. You can't do anything and you feel helpless. It simply means that you've done your money. If you had Casino Credit set up, and other casinos within the MLIFE properties extended it, then you are extending potential losses well beyond what you brought to Vegas.
Again, our intentions may be that we will be in total control of our credit line. Well, if that were the case, then you would have left the table before you lose your entire bankroll on it. That's the point....control is everything at the table. Credit Lines may seem convenient, but they are not. Transferring money in advance to the Hotel Casino cage (like I do) is convenient. I can also draw on that cash in MGM casinos on the strip. But...its MY cash. I brought it. So, what I know is my cut off limit of losses (and that includes factoring in the possibility of drawing down cash on an ATM every 24 hours). A Casino credit line can burn below that because it's available.
Now, it may be that you come to Vegas with nothing, and you expect to only use your credit line to play with. I know some players that do this because they simply don't want to touch their accounts and carry money around, and want a free loan. Well.....hmmm.....It's like that free beer at the craps table. The fact that you are risking $$$ per roll should qualify the 'freebies' on offer. The 'free room' isn't actually free either. You have to create your Theo to achieve comps. You have to risk money...lots of it. It's not free.
It's the old adage....play with what you bring with you. Lose only that which you have budgeted to lose, and have an unlimited winning expectation. For convenience, you can deposit money in advance to the casino cage which your host can help you with. This also helps when sending money back to your account when you win on your trip. Unless you like carry wads of hard currency.
Good luck in your next trip !!! Bring your cash and take a load back !!!