Jon,
NGF did a study on DFW public golf courses five years ago. It showed (from memory, but close) 15 of 16 courses that renovated increased revenues, no word on profitability. I think they mentioned what is mentioned here, that the differences in how muni's finance and account for courses varies too much.
As you might expect, the courses that spent $4M and over to rebrand had the highest revenue gains, while the courses with more targeted renovations (often, greens resurface or green and tees only) for under $4M and
way less
revenue increases, but had higher ROI. In other words, it doesn't take a total remake to interest golfers again. Better greens often does it. And, duh, the less you spend (to a degree) the better, presuming you fix your most glaring problems.