Greetings, I am going to weigh in here, not because I am any kind of Yoda at all, but purely from a common sense point of view. I hope that's okay.
I would deduce that if anyone was able to know when a domain was released and how soon it sold thereafter it would have to be the domain registrar. So, let's say, hypothetically, that some domain registrar decides they are going to start publishing a list of domains that were released for sale and then sold immediately. Then let's say Google gets a feed of that list and just automatically, via the algorithm, discounts every single one of those domains down to PR 0, and strips them of all potential link authority value...
I'm sure you can see dozens of problems with that scenario. Here are just a few:
1. No one can really evaluate the new owner's identity or purpose without knowing who the new owner is. If registrars disclosed that information, I can't even imagine the number of privacy issues that would arise.
2. The assumption would be being made that the new owner is not the same, related to the old company. I'm sure there are plenty of cases where this happens.
3. Google would be making the assumption that the selling of the domain to a new domain owner was to end the business. Again, there are probably many many instances when this is not the case.
It seems to me that Google, nor any other search engine, can reasonably deduce the motives of a new domain owner. I mean, there are some smart folks at Google, but I don't think clairvoyance has entered the algorithm yet. Consequently, it probably seems more reasonable to let expired domains retain some of their value with the belief that most business owners are only going to buy domains relevant to their business and that end users will cast their "votes" for how well these new owners use the real estate by exhibiting either engagement or bouncing and viewing another site. Eventually, the algorithm will more or less accurately sift through the results and serve up results that visitors find engaging.
Sure, maybe it works for a year, two years, hell, even three years. So maybe this approach is viable, for now for a website or a page that just seeks short term benefits. But, if what you are building is a business that you want to last, a brand that you want to matter to people 20, 50, 100 years from now? Then I think there are far better uses of your time, effort and resources.