At a minimum, ANY domain you buy should be put to use whether it's parking it, or making a mini site. Spending the $10 for registration means you had an idea. Go with it. The beauty of the web is that you can let your idea evolve or change over time. Test the waters and see what happens.
We have hundreds of mini sites that direct to various different things, from our hosting site, affiliate programs with stores, and informational sites. We don't spend a ton of time marketing or branding the others, but they bring in a little bit of traffic and revenue.
Make a mini site, pop up informaiton, link it back to you - at a minimum you've at least created an inbound link to your site which will help in a search engine ranking
