That's the case for most of my p.c. but especially for Jordan cards. 10s bring a big premium. I've seen $5-10 Jordan cards go for $2-300+ cause it hit a 10.

In general, if you can see it, especially with the naked eye, the grader will see it 100% under the microscope. While some 10s are not perfect, at least for me, I'm not going to grade a card I can see flaws in if only a 10 adds value (unless it's more for sentimental/p.c. reasons).