I think the emphasis in basketball is greater in the Summit League than the SLC. I can see improvements in the Summit League in Baseball. Oral Roberts has great facilities as do other universities in the Summit.
I also believe comments about SLC investment might be a little harsh. Below are a few examples.
Houston Baptist University - Announced a $160,000,000 Investment. Part of the plan is a new multipurpose arena which will be the new basketball home.
http://www.hbu.edu/About-HBU/The-Campus/The-Future-of-HBUs-Campus.aspx
More details here starting on page 20-21 (page 11 of the pdf file): http://www.hbu.edu/HBU/media/HBU/publications/hbunews/NewsV-50_N2_09-2013.pdf
"...A new basketball arena will anchor the space, providing
the only entertainment venue in Houston that can cater
to audiences of 3,000 to 5,000. This distinction will enable
the University to lease the facility for a variety of concerts,
conventions and other public events... (Excerpt from Page 22)
University of New Orleans - Basketball - 10,000 seat on campus basketball arena - Lakefront Arena, home of the 1991 NCAA Women's Basketball Final Four and home of the 2014 Sun Belt Conference Basketball tournament.
Link to arena website: http://arena.uno.edu/building_info_overview.aspx
Baseball - Maestri Field - $3,000,000 renovation in 2013 http://www.uno.edu/news/2013/SignsofProgressVisibleatSiteofUNOsMaestriFieldRenovationProject.aspx
and http://www.uno.edu/news/2013/UniversityofNewOrleansCelebratesRenovationsatMaestriField.aspx
Abilene Christian University - Recently received $55 Million from three donors toward $75 million academic and athletic facilities fund raising campaign. A portion of the money will be used to build a new track and soccer stadium in addition to a new on campus football stadium.
Link to "Vision in Action" fund raising campaign (Track & Field/Soccer Stadium page): http://www.acu.edu/via/soccer.html
University of Incarnate Word - I haven't seen any specific announcements for UIW. There are plans for enhancements, but they made end up using off-campus facilities for some of their athletics like UTSA is doing.
Others
Texas A&M - Corpus Christi - Completed construction in a $9.6 Million New Track and Field / Soccer Stadium last year.
Link to Stadium website: http://www.tamucc.edu/marcom/stadium/index.html
Basketball - Off-campus Arena - American Bank Center - http://americanbankcenter.com/info/history/
Baseball - Off-Campus Field - Whataburger Field and other TAMU-CC Facilities - http://goislanders.com/information/facilities/index
Sam Houston State
Baseball - Sanders Stadium opened in 2006 - http://www.gobearkats.com/ViewArticle.dbml?&&DB_OEM_ID=19900&ATCLID=1275332
Basketball - Johnson Coliseum - Four years younger than the Mabee Center - http://www.gobearkats.com/ViewArticle.dbml?&DB_OEM_ID=19900&ATCLID=1275315
There are some others also. For example, my university just completed a five year campaign raising $132,000,000. The original goal was $100,000,000. Of that amount over $20,000,000 was spent on athletics as part of over $60,000,000 in athletic improvements over the last five years. We have a new on-campus softball stadium that will be built this year. Also, coming up is $5,500,000 in renovations to our baseball stadium. Central Arkansas built a new baseball stadium opening in 2009. They have made improvements to other athletics facilities also.