Likely not exactly what you were looking for, but it could be a driver for increased Membership and External Organization involvement (which could attract funding) that could lead to a thriving LUG:
More along the lines of what you were looking for, here is another reference:
Much older, but offering what looks like a broader scope of considerations as food for thought (N.B. by the same author of the above reference):
For Ubuntu specific references, have you looked at
An older reference, but sometimes older is good,