they could've invested properly into at least 1, maybe 2 world class experiences and built a destination like PA or EP, but no, lets get a skyline park moto thing HAHAHAHAHA.
I think the logic of Parques Reunidos is that the park is "readily developed", so that they don't need to add any more to it. It is essentially "complete", since it already attracts a lot of guests and makes a lot of money. When they buy a park, they don't need it to grow further, only to sustain the income it had at the time of acquisition. Sort of like loading an RCT save with a park that has already completed the scenario goals, and is making money. No need to build anything more, just maintain what is already there, and pocket the profits it makes. Let that RCT save run overnight, have tons of money come morning, give it all to shareholders or use it to buy another park and do exactly the same.
It seems like they approach theme parks like other developers approach office buildings. It is common to own a building, pay for maintenance, and let rent money trickle in. No need to add a floor, expand with a new wing, or change the facade just for the sake of it. Spending money is a risk, since you don't know whether you can attract more tenants or increase prices to make your money back. It is safer to just buy buildings that have everything in order, long-term rent contracts already in place, and let things take care of themselves with minimal investment.
Judging by the amount of money Parques Reunidos makes, this strategy apparently works from an financial point of view. Buy parks that have a solid customer base, enough rides to fill a day, and little competition in its segment, and let them make money. Occasionally they add a cheap ride to sustain the visitor numbers, but they seem to shy away from big, risky investments. Sure, the park stagnates, visitor numbers plateau, and rides eventually wear out, but with some "clever management" (understaffing, shutting down rides that cost a lot to maintain, increasing prices, etc.) they can still run a profit. I don't think any Parques Reunidos parks are directly unprofitable, but if they happen to dip into the red, one can always do another round of cost-cutting. Or maybe just sell off a park, if there's nothing left to salvage. The chain hasn't been in that situation yet, though, so it's hard to say.
Looking at their website, it's extremely clear that Parques Reunidos is in it for the money, and for the money only. The parks are company assets, how exactly they make money seems to be of secondary importance to the company. I made a lengthy post about it a couple of months ago.
F*ing soulless, dirty cash-grabbers.