Welcome to WebmasterWorld Guest from 18.104.22.168
I wouldn't bother with bluewidgetdohickies.com unless you have the time and resources to make bluewidgetdohickies.com a successful site all in itself. For example, maybe there is a niche your main site has trouble promoting. But don't buy the domain if the sole purpose is to promote bubblegum.com.
That's my opinion.