I agree with you, that exploit was bad and damaged the economy. But don't take it personally as money that you made. Take it as a game. I know it is not fun that some one ruined the economy for your character(s).
I have been here from January 2006 and all the shinnies that my characters have accumulated over the years are not as shiny any more. The only thing we can do is be vigilant in reporting possible exploits to the authorities; and let them be the vengeance against the exploiters.
Even money in the real world cannot be worth the same after 20 years. Money depreciate. Take 10,000 dollars from the 1990s. With 250,000 you can buy a good three bedroom house in the Suburbs west of Boston at that time. But now, the same house is selling for $500,000. The money is not the same. The government is printing more money while we speak and the dollars we hold on are no longer worth the same.
Its better to think of what you invest in for your time. Of course, all the shinnies our characters made over the years can be the pride in itself since our characters obtained them legitimately; and no one can take away our accomplishments (TR past lives; maximum favor, etc.) regardless of the economy.