And since when has a company been in business to not make money?
I can give you one reason why the owners of CGC would keep it in business even if it was losing money - they all own large, extremely expensive comic collections that have increased in value due to CGC by more than they have lost running the company. I don't know if this is true, but their are innumerable money-losing companies that stay in business because they are lost leaders to generate profits elsewhere. In my job I do lots of projects at a loss because there is the possibility of much more lucrative work after the project is finished.
You speak like their books are open to you. Prove they are not making money.
Obviously their books aren't open to me, but there have been many threads on the CGC Boards discussing their profitability and the concensus is that they don't make a lot. If you grade 1,000,000 comics over 10 years at $30 each you are only making $3,000,000 per year. Out of that you have to pay for the slabs, sleaves, labels and slabbing. Then there are rent, salaries, benefits, maintaining a website & chat boards, setting up at conventions and the travel for employees to get there. I'm sure they have other expenses I haven't listed. One way or another, the profitability is simply not enough to attract other, serious competitors into the market.
If CGC has issues with its work then it is up to us and those who buy their service or finished product to demand improvement and accountability.
No one is willing to kill the golden goose. Why would I complain about the problems with CGC if I can crack, press and resub over and over again for a profit. There is no incentive for big slabbers to complain and the regular collector doesn't submit enough for CGC to care what they think.
If they have a problem with their business model that is a problem they need to fix.
All you have to do is go on the CGC boards and read the daily complaints about CGC's service. People are complaining all the time right on CGC's website, but they simply don't care. $15 to check the graders' notes for a comic you paid to have slabbed????? This is a joke, but CGC doesn't care if clients are unhappy because there is no other grading alternative and collectors are compulsive enough that they will probably swallow their medicine and pay the $15 anyway.