Did you know...
- In 2011, spending by Texas public libraries totaled $544.9 million, but economic benefits topped $2.407 billion? That's $4.42 return on investment (ROI). 
- The University of Illinois determined that it's library expenditures in 2006 resulted $4.38 ROI, which was based on the entire library budget. If only collections expenditures were considered the ROI would've been around $12. 
- A 2009 report from Colorado (using data from 2006) looked at eight library systems, chosen at random, from metro and non-metro, urban, suburban and rural communities. All libraries showed positive ROI, the lowest being $428 and the highest being $31.07 (an outlier). The median ROI was $4.99. 
- A 2004 report out of Florida calculated Florida public libraries' ROI at $6.54.  A 2010 report estimated the ROI at 8.32! 
These are just a sample of the plentiful data you can find floating around cyberspace. Check out the Illinois Library Association as a resource to start your own search.
I like libraries for what they are, but the economic gains are nothing to sneeze at.