When seller with good feedback says NM I automatically assume that it will be VG+, and in 90% of cases I am correct. When it says VG+ it is quite a range that I got - from VG- to true NM. So I usually expect VG+ record and the right to return it. No need for new grading system, it would only confuse the issue further.
I talk to sellers too in some cases before buying.
I talk to sellers too in some cases before buying.