Do you think the Nats are listing postseason tickets on Stubhub?
No, the Lerner family wouldn't risk public ridicule just to make a few extra bucks.
Kidding aside, I doubt it but I wouldn't blame them if they did. If I owned a team I'd look into selling via an auction so that the highest bidders get the top seats, row B would be cheaper than row A and less than row C. Let the market set the value of the original sale price and not just the resale price.