Other question doesn't matter. Be careful what contracts you sign.
So, let's assume you've bought up the "key roads" through a city in a grand master plan to lose money. You impose "whimsical" rules on those roads to deny yourself traffic. We'll even assume that you cannot be routed around on existing roads. (Seriously, play around with this on Google Maps or OpenStreetMap, see if you can actually block traffic by buying up a few roads.) Those "other people" won't have to sell. They'll build roads themselves, to get around your ridiculous restrictions, and make a little money, to boot. Then, once you've gone out of business, they'll turn those ad hoc roads back into gardens or whatever they were before you decided to waste a bunch of your money.
And that's, of course, assuming this (or something like it) doesn't ruin your plan.
Ok. You can just assume that you currently live in an AnCap world where most contracts are implicit and in them there's a clause that says that most disputes that can't be solved by something called a law-book is solved by majority vote. You are free to move anywhere, but be aware that most AnCaps in this world share this view.
Have a look at any major city. An accident in the wrong place locks the place up for hours, even if you can route around the accident. And in in most cities they have these things called "houses". They kind of block they way for new roads.