This is really not the right question to ask, because all you will get is anecdotal evidence, backed up by no proof at all. After spending many years as an appraiser, I've found that very few high mileage claims can be proven, and that most engines with ultra high miles have had work done to them during their lifetimes.
As a general rule, statistically speaking, a modern 4 cylinder engine should have a life expectancy of between 175-225K miles before something serious occurs. Some go less, some more, but that's a very realistic range.
What you have to do when you buy a vehicle with that kind of mileage, is to a) check all the service records, if they exist and b) deduct accordingly on the price for the mileage. I would think around $3,000 should be plenty for this car, maybe $4000 if it's from a dealer, has lots of options and is very very clean.