It shouldn't "almost" sound like - that's exactly what I'm saying. JB5150 states it pretty well - if you have $300,000 of available credit, credit card companies may not want to take you on because you could be $300,000 in debt tomorrow.

Now, it may be a little more insidious as well. AT&T used this as a reason (or more accurately an excuse) to cancel my 20-year-old Universal Card. I'm sure the real reason is that I didn't use it for 15 years and they were just trying to clean out old accounts, but it may not have been legal for them to close it for the real reason.