Give it to me straight

Currently in the process od buying a 1920 American Foursquare. We pretty much assumed that these floors were not going to be able to be saved. We got a quote from someone for $9200 to sand and seal the floors. And the 2nd person told us that they have seen there life, sanding anymore will ruin cause more cracking in the tongue and groove. Anyone have any advice? Thanks in advance!