I don't know what the sales or print numbers do be, but they generally sell out. The Sienkiewicz one just released the past few weeks is already out of stock everywhere.
I'm just more annoyed at the long-term implications of their abandoning the line. I know IDW's Artist Editions guys have contacted DC about collecting certain works but were told no - and now that DC/Graphitti Designs aren't doing em themselves it leaves a whole lot of work off the table.
IDW haven't released a DC collection since last year, so looks like it's all but done