Alfred, I would think 15 to 20% max should surfice the increase in price you found is simply based on Greed in my opinion.
Someone in Europe had reacently a motor removed, rebuild and reinstalled at a cost of € 17,000.00 I wonder what that cost might have been 8 years ago. I know it all depends on new and refurbished parts used during the rebuild. Still I am sure it was significantly less years ago.