I value the opportunity to freely roam through the collections and learn by observing the plants. Here’s a service you could consider providing: Make your digital archives available to researchers and/or members on line, something like the USDA GRIN website. I bet there are many people (like myself) who would like to learn more about the source of original plant material, discovery records, documented observations, narratives, etc. This could be a paid-for service. Allowing interesting persons access to that information would hugely increase the value of the arboretum.