The Farmhouse gives the ho-hum, nondescript cover for the illegal and clandestine operations that lurk just beneath the surface. I like to envision the land as a front to keep up appearances and this location does that better than most. I also like that it occupies the middle ground between Los Santos and Sandy Shores; far enough from the action, but just close enough to be convenient. Some practical benefits are the proximity to the freeway, the Route 68 mod shop and the Airfield.
It's my bunker of choice too.
A GTA online 'tourist' got in touch over the weekend to pick my brains on all the updates since last Christmas. I showed him around my bunker, told him about the MOC, paywalls, randomwalls, and explained why all the staff and personnel are standing around doing nothing, guarding storage space with nothing inside. It was a bit embarrassing explaining that bunkers have no further use for me in GTA online. Now that I've unlocked all the research it remains shut down, just like the Hangar cargo space is also empty and unused since I completed the 42+ cargo runs to unlock the cheaper prices. And then I realised I don't use my Meth lab, Counterfeit Cash factory, Weed farm OR Document Forgery business either. It's pretty sad.
Don't get me wrong, I love having access to all these places and regularly relish the variety of freemode operations, but I only use about 30% of the stuff I own - an occasional Coke run, or the stocking up of a special cargo warehouse or two, or some I/E collections/deliveries.