I purchased even though I had no imminent dev project going on.
Knowing about the cost (time and money) to spin up test environments or using services offering similar options, this is a no-brainer.

Another way I am goin g to use this is to setup a disposable environment to test new tools for my future arsenal. Most Open Source projects come with docker containers/git repos to run your own copy. Prior even letting any code run on my own machine(s) / environments, I can spin it up here, play, test and evaluate new "toys" and tools.