Seems like a great way to test plugins and themes in a clean environment. Premium themes could use this as their demo too instead of having to keep a demo Wordpress running.
Then you don't get updates/fixes. And may need to edit the code after acquiring it, to stop license checks. And you'll need to go to the effort of extracting the relevant files from the environment in the browser.
Overall... yeah, sure, maybe, but anyone with any amount of money in their budget for this at all is just gonna pay instead of dealing with that.
