On grading MS business strikes!

I would also like why NGC has placed a lid on the grades for many of the morden coins. I am sure, we send in to NGC just as nice of coins as PCGS recevies and yet for example ngc has topped out state quarters at ms 67 and pcgs grades many 68s, also the sms set which would grade PCGS sf 69 are NGC 67s, not to mention the Dollars you cant hardly make a NGC 67 and PCGS are all over ebay! What is the deal are they handing over the modern business altogether to PCGS! You cant compete with them in the NGC registry set.The coin are just as nice as any PCGS but the grades are LOOOOOOWWWWW! Why is it!