^^^I think that applies more when you're trying to be an artist. I don't think it really matters if you've done anything in the past when it comes to submitting beats, but what do I know? I've done stuff, lol(nothing at all big, not bragging, but just saying).
Now that probably applies when wanting to get your music heard for other resources, but if an artist is looking for beats or a TV show needs instrumental music, I think the only thing need apply is that the beats fit the project unless you're superproducer status. Then they'll go with you because you're known for selling sh*tloads of records.