For the sake of argument let's suppose that this is true. There are a number of things that could be done to increase the number of sales, improve the experience of customers and prolong server rentals beyond the initial purchase.

The main issue which springs to mind other than the abandoned state of the game itself, is that information on the PlayerWorlds rental service is spread largely by word of mouth. The only information about the service provided by the website is how much it costs, and how long it lasts. It does not provide any information as to what the service entails, how it works, what options the customer might have or where they can obtain support or discuss their project. The information contained on the Wiki here should really be on the Graal website. Then there is the issue concerning advertisement and even lack of acknowledgement that the server rental service exists throughout mobile Graal.

Then there are a whole host of issues which concern after the initial sale has been made. In terms of basic support, there are currently no active PWA staff or designated support addresses for those who have purchased a server. Anybody who does not have their problem resolved (which I have seen happen even when Carlito was active) is not going to extend their server subscription. In terms of customer resources, there are of course many scripts/systems published by the community on the forums/Wiki, but these are largely fragmented and require a user to go in search of a specific solution; ideally there would be some form of organised list of recommended resources. I also believe it would be beneficial if official servers published some of their re-usable resources, which is something I'd be willing to do with GtA if the server was endorsed & promoted.

One of the things which made Graal great to begin with was that just about anybody could get some form of content online and be able to easily show it to or play it with their friends, and it didn't matter whether it was a good quality or whether it was unique compared to other players work, the novelty was that it was "theirs". With the game being killed off and the global playercount becoming a fraction of what it once was, this is a novelty which has become almost impossible to reproduce.

Of course as a newbie developer we all like to believe we're creating "the next best server", and while this never comes to fruition, it is a learning experience which given refinement over time can lead to bigger and better things. I don't believe Graal is in anywhere near a good enough state to discuss it as a serious game development platform for those few who possess good coding ability from outside of Graal, and I say this as someone who codes for a living.