The cost of TPG
grading are about what the error coin is likely worth on the market.
If your motivation for TPG
slabbing is a way for your heirs to sell -fine.
If your motivation is flipping the coin for current cash then IMHO the TPG
costs are a waste of your money - all knowledgable collectors who specialize in error coins know what this is.
Take a look at my other hobby ... http://www.finewoodcrafter.com
Too many hobbies .... too much work .... not enough time.