Toning Causes a 2000% or 20x increase in value in a common date modern Lincoln
I am making no judgement on the wisdom of this, simply observing marketplace reality.
Take two common date 1979-D Lincoln Cents ... both slabbed NGC ... both in MS66 condition ...
The untoned RD ones are going begging at $24 each (few want them -- over 10 are still for sale with few takers). Maybe if the price dropped to $20, it might sell a bit better? Maybe. Lets assume the "market value of an NGC MS66RD 1979-D Lincoln Cent is around $20.
Take the same date (1979-D) and condition (MS66) Lincoln , but this time it's colorfully toned, graded NGC MS66BN. In this case there is a mad scramble --- there are 30 bids in 1 week, and it hammers for $406.00
That's a 20x increase in market value!
I know that PCGS is very locked into the paradigm that RD > RB > BN in the price guide. But in many cases, the reality of the marketplace tells a different story entirely.