If I find a PR5 domain or w/e when I register it will the PR disappear cause I was reading the find valuable domains thread and noticed that this happen to some people if I understood correctly. EDIT: Sorry Forgot, Also how can you tell if something has fake PR? cheers.
Yes, it will go away very fast. You can try to sell it before it goes or try a few techniques (build up traffic again) and hopefully it will keep the PR.
No, there is a point. It should still have a few type-ins, might be able to sell it quickly, and you might be able to salvage the PR if you act quickly.