First, I'm talking about monarchs, not dictators, based on the distinction I explained. Second, as to monarchs being far sighted enough to understand that laissez faire makes for a richer country, and more income for them, why is that "a helluva jump"? Is it "a helleva jump" to assume that someone who inherits a business (much like someone who inherits a throne) would be interested in how to make it more profitable? Of course there are sometimes prodigal sons, who may screw things up by incompetence or laziness, but rarely do they torch the factory for funsies, or whatever else would be analogous to abberant behavior by a monarch.
There are hardly any monarchies in the world, only six (6) by my count (with GDP/capita PPP)
1. Brunei, $80,000
2. Bahrain, $52,000
3. Oman, $46,000
4. Saudi Arabia, $55,000
5. The United Arab Emirates (a federation of monarchs, actually, rather than a single monarch), $68,000
6. Vatican City (unique and not representative of other monarchies, but nonetheless), can't find data, but must be very high
For the US, GDP/capita is $53,000. The world average is $15,000.