I managed a property for several years that included all utilities (note: it was an AC-free community, so no major overages there). Part of what helped with the management of utility expenses was simply having the dialog with residents. Utilities are included, but not infinite. We were also in a big "green" area: dark sky city, green energy buildings in town, energy efficiency and environmental footprint conscious, etc. As new residents came to the community we would remind them that we as a community were equally responsible to each other and the larger local community for responsible use: abuse of the system might impact everyone. I think in almost five years at that property I had to have a separate conversation with a total of two people who were using too much electric or gas! We also got residents on-boarded to energy efficient bulbs, added recycling, shared energy efficiency tips in newsletters, etc. It was part of our culture, and accepted as "expected" behavior.
We also used lack of caps as a marketing tool a few years ago. We emphasized to folks that came in that some other communities offered "utilities included" but capped them; we'd add that while we didn't cap, we did expect all residents to be part of our efforts to be responsible stewards of utilities, and many prospective residents both respected and liked that. Some shared that they viewed it as our community having "culture," and they liked the idea of being part of it!