So the question is will the going private deals (some, all or none) be fairly valued.
Yes. ...if you believe that 80% of book value represents "fair value". I've seen companies go for 40% or 50% of book value but those are either losing money or growth has completely stalled resulting in future losses.
The problem with pink sheet stocks is that they have to report earnings first. Even then, nobody will acquire them for a 1000% premium. I suppose it happens, but it's not something that happens easily. So, some of them go dark. Some may relist or seek a listing in Asia. What matters here is the intention of management. So, ABAT is a good bet and CSGH is not. Or maybe all CSGH needs is a new CFO, who knows.