If there are 100 boats on the lake, each with its own 150 ft circle around it...how can that possibly take up more of the "lake footprint" than 1 boat with a single 150 ft circle around it?
Lets make a couple assumptions, then some calculations based on those.
1. A smaller "family" boat is a 23 ft bowrider. Average width might be 8 ft. You could say that the boat occupies 184 square feet (23 ft long x 8 ft wide). Not exactly accurate, but close enough.
2. A larger "fast" boat is a 32 footer. Average with probably about the same 8 ft. You could say that this boat occupies 256 square feet (32 ft long x 8 ft wide).
3. 100 smaller boats, each occupying 184 square feet, occupy 18,400 square feet (100 boats x 184 sf). This does not take into account the 150 ft circle around each. Sorry, that math is too much for me.

Let's just pretend they are all rafting.
4. 1 larger fast boat occupies 256 sf, as determined above. Same 150 ft circle too.
Conclusion-The 100 smaller boats occupy 18,144 FEWER square feet than 1 single larger boat...again, not taking the 150 ft circle into consideration (18,400-256).
So tell me again...how does 1 large boat have a larger footprint than 100 smaller boats?