Technically, IMSLP did provide hosting to a couple of small publishers. Poon Hill Press, the small company owned by Mr. Severo Ornstein, the son of composer Leo Ornstein, actually encouraged the upload of all his father's available scores onto IMSLP. He looks at it from a very different perspective than the bankers and lawyers who run the estates of Bartok, Strauss and the other composers UE was comapining about. Namely, he wishes to encourage the diseemenation and performance of Leo Ornstein's work.
The promotional method was also in operation for the estate of American composer Tui St. George Tucker, whose manuscripts were posted at IMSLP. Under the legal definition of "publication" in the US (and probably other nations as well), IMSLP was in fact "publishing" the works on its site - even though there was no commercial aspect. That's why we employed the different Creative Commons Licenses for Ornstein, Tucker and all the self-published composers who uploaded works here.
In an earlier reply to Mr. Irons, I even suggested that UE should upload scores of works for composers that were new or not well-known and provide links to sound files and to UE's site where visitors from IMSLP could purchase printed copies or rent performance material. IMSLP is for freedom of access - and that even includes the freedom of access for publishers like UE to make selected copyrght items avaialble to visitors here for the purpose of promoting performances. I have no problem with IMSLP having links - not ads - to multiple sites where a printed copy of a score - even a copyright one - can be purchased. IMSLP could even serve as a neutral forum where comparison of prices, print and edition quality could be made, along with reviews of different scores. Mutopia has gone even further and has set up a system for actually purchasing printed copies of items on its site via Lulu.com.
Homer above makes a very fine point about the actual cost involved in printing and binding a score oneself. This is especially true for opera scores with hundreds of pages. As I stated on a pre-shutdown thread, the largest reprint publisher in the world, Kalmus, was not upset or concerned about IMSLP in the least. They are well aware that it is ultimately cheaper and significantly more convenient to purchase a nicely printed and bound score on decent paper than to print out one with an inkjet printer one-sided onto thin letter paper and bind all the loose sheets.