"State of (This Industry)" annual reports are fairly commonplace and are usually worth at least a quick scan or read, perhaps focusing on the named expert(s) you trust the most for intelligent analysis and for "putting it out there", i.e., revealing insights that others may "hold close to their vests" (not readily reveal publicly).
I've bookmarked this for later reading after a quick scan. Many familiar and well-qualified authorities have chosen to contribute.
IF you do any business in the domain aftermarket this is likely going to be a helpful "general fund of knowledge" piece.
No one article will define what any domain is worth but at least it will give some insight into trends in values and valuations, and a various other topics.
] The State of the Industry 2019: 21 Experts from Across the Industry Assess 2018 and Predict What Lies Ahead