I am not sure what you are getting at with your insistence on the meaning of fractional cost. When I search that term on Google, Bing, or DDG, all I get are hits on how much fractional lasers cost, and whether it is worth going in halvsies on a business jet. But when most ordinary normal people say "a fraction of..." when referring to the price of something, they simply mean a lower amount than expected.
Also, yes there are aggregate patterns to the price of homes in general, but if you think that market forces are the only force at play in the price of an individual house, I have difficulty believing you have ever bought or sold a home before. For example, a DIYer may be more willing to buy a fixer-upper house at a higher price than someone else, as the other person would want to negotiate lower in order to factor in the price of a contractor to fix the problem. But as DIYers are rare among home buyers, it may take longer for a DIYer who likes the home otherwise to come along.
Then again, you may just be a troll, so I shouldn't have even bothered replying.