I'm looking for art market related data for research purposes - especially sales in auction houses. I know there are sites like artprice or its free equivalents, but what I'm searching for is something like a structured database, CSV files or linked data ready for further processing, since crawling these sites is forbidden. Any suggestions?
Maybe start an open database of auction results? It will never be as complete as commercial ones, but I'm sure there are many people who would use it (and possibly add content).
Looking for art market data for a project I found this OKFN (Open Knowledge International) blog post in the field you specify:
Art Open data. This leads to a wiki page (not to useful IMHO but it shows you are not alone looking for this kind of data, you can ask in their mailing list also).
I found an "art market for dummies" visualization description on a data-journalism website, but links are broken... Had to go to archive.org to get something useful out of it, this one seem reliable on auctions ad market data:
ArtValue has a [http://www.artvalue.com/free-appraisal-art-work.htm](Free art appraisal) page.
The article Domestic and International Art Market Sales Statistics says "You'll have better luck trying to count the stars in the sky than collecting meaningful art market sales data.", which seems appropriate.
I work for Quandl and noticed we have (premium) data on sales for Sotheby's here: https://www.quandl.com/data/ZSS?filterSelection=all&keyword=sotheby%27s
If there are any other publicly traded art companies you wanted to look up, you can try searching for them on Quandl (https://www.quandl.com/) to see if we have data on their sales or revenues.