This would almost be like value discussion. The whole point of getting rid of VD was to eliminate standstill prices. This would also help the GTL to allow supply and demand, and the economy itself, to determine prices. If someone places a Pokemon up at a price and it doesn't sell, then it shows that they might want to lower the price. We shouldn't let past sales or prices skew future prices.
Shinies should not have baseline prices. We cannot change the past, but imagine if PokeMMO would have had the GTL right away from the start and yen was used as a primary currency (instead of lucky eggs). I can give an educated guess that things would be much different and that certain shinies would not have such astronomical prices compared to others. Of course, shinies would still have variant prices, but they would be more sensible. The Set Values/Value Discussion mindset is unhealthy for the economy. It's unfortunate that players have the want for baseline prices stuck in their head in my opinion.
Values are subjective. To say the prices are "wrong" or that players "don't know values" is saying that they are required to value a Pokemon at a certain price or range.