Learn to grade your own cards.
Over the period of time, all of the graders have proven to make mistakes ala former collectors ... and when they made them
... they were louder. 
So if you're a collector, and you want to save yourself some money ... don't be lazy ... learn to grade your own.
If you feel better by having the card entombed, put them in your own holder.
However, if you're a flipper ... get them slabbed by some one.
It's more presentable for the Market.
You'll always be better of, by learning how to grade your own.