I think it'd be difficult to balance using profits for massive infrastructure versus mandatory taxation. And I don't think the whole "pay to play" concept is all that bad when it comes to things like roads, public transportation, and so on. I do believe we're moving into an age of self-sufficiency, where things like vertical farming and sustainable energy production will start offsetting the traditional sources of food and power, shifting the majority of economic focus to more abstract things.
Also, I like the idea that across a giant geographical region, I can be assured of consistent laws and rights. With AnCap, if North Dakota wanted to implement capital punishment for misdemeanor trespassing, and South Dakota didn't even have it on the books, then a lot of South Dakotans are going to get offed because of inconsistency. OK, that was an extreme and ridiculous, but imagine how a slew of subtle differences in laws could create difficulties between unsuspecting citizens? A semi-decentralized state might be better.