This is one of those net present value problems that are the delight of bean counters: what do you pay now for assets that may acquire great value in the future. In this case, with no clear idea of the timescale, nor any way to accurately estimate the future potential value.
The assets are a currently-uninhabitable planet and a newly-discovered wormhole terminus. The timeframe and cost of terraforming the planet could probably be determined fairly accurately. The revenue to be gained from it, probably not: it would depend on the current demand for habitable real estate when the project was completed, and if - as seems likely - terraforming would be a long process there would be far too many unknowns involved. Because the terminus was in previously explored but, apparently, unexploited territory, and because it was found quite early in the history of junctions, before there was much experience with the way they influenced development in the surrounding area, the future value of the terminus was probably regarded as impossible to measure - or maybe not even taken into account in the calculation. That would be particularly true if the immediate surroundings were known to be largely uninteresting: easy access to places nobody wants to go isn't really a high-ticket item.
It wouldn't be surprising if Mesa was valued no higher than Manticore had been, if that much. It would certainly fetch far less than the value 6 centuries of experience and development attached to, say, Basilisk. In fact, I'll bet that the Detweiler Consortium couldn't have afforded the system at it's 20th-century price.
Jonathan_S wrote:On the flip side that was the cost for a system about 700 years away by cryogenic slow boat. There was no guarantee that hyper travel would become safer, so there was a good chance the colony might never receive more than the extremely rare port call by a passing survey ship that might drop off electronic mail. No new colonists, no routine interstellar news, etc, etc. That immense travel time and isolation should have driven down the cost to aquire rights to the system, no matter how nice the survey results were.
In contrast by the time Mesa was colonized routine safe hyper travel was almost two centuries old, making colonization far less risky. And Mesa was closer that Manticore to the center of human civilization (Earth and the League). Those should have tended to increase the bidding for nearby systems; especially one with new and rare wormholes. Even if there was no immediate economic payback it wouldn't be hard to realize there was a decent chance fhey'd become paths of exploration and exoansion, leading them to be trade lanes, which could be a source of revenue. I guess the gripping hand would be that with a couple centuries of safe routine hyper travel people had lots of even more earthlike planets the colonize, which might depress the price of more marginal worlds, even if they're not so far away...