Having just attended ITA for the first time, I really appreciated the ""no selling"" rule, no tables/booths, and sessions that were primarily about processes and business improvement rather than software specific. All of the major publishers are there, so as consultants we have access to them if we need to.
I have no issue with expanding the reach of 90 Minds by including other publishers, but at this point most of the members are Sage-centric and are looking for information that will help them in their Sage consulting practice. Including sessions for other publishers now and in the future may dilute the time devoted to that purpose for those consultants. SAP having a presence may be all that is required for those consultants that want to have discussions and pursue questions about SAP (and other vendors).