We really overthink (and underthink) this stuff, in my opinion.
If a bigfoot is hanging out in a particular area for a period of time, it has a reason for doing it. If it keeps coming back regularly over weeks, months, and years, you can bet it has pretty good reasons for that too.
I'd say the big three reasons are Food, Safety, and Potential Mates (going all Maslow, on you here). The order of priority is going to vary depending on the individual and the prevailing circumstances (availability of food based on time of year, human intrusion into group areas, etc.). If a group is being provided with food, and the people providing food for them (knowingly or otherwise) leave them alone, then they're going to have a reason to stay and less of a reason to leave, especially if the females of the group are feeling well fed, safe, and more inclined to be potential mates. Just a hypothesis.
Water is another reason that bigfoot may stay close to a particular area, but it gets overlooked.
Someone; Byrne, I think; proposed that bigfoot only populate areas where there is at least a certain amount of rainfall, and that perception persists, but it isn't universally true. I've shared sightings on this forum from arid areas, and others have reported bigfoot in relatively arid regions in the Southwest, often near small lakes. I'm certain that their populations are higher in areas with greater rainfall, but it may be that the chance of encountering one is lower there than in arid areas from which we have reports.
Here's why I think this. In arid areas water is both scarce and vital, so resident or itinerant bigfoot are going to be drawn to them. Humans in the area are also often going to use these areas for property development, or for recreation. This brings them together. Really, this is nothing new if you get right down to it. Look at any African watering hole in the dry season.
So I'm thinking more and more, that if I ever get a chance to do some field work, I'll be looking at water sources in arid areas as a possible study area.