04ÌýMarket Potential PR companies make a decision to take on an artist based on career prospects and commercial potential.
"For us to take an artist on we have to know that there are outlets for the music to be played. The music has to be strong enough that you can get it played on radio."
Jon Turner
Force 5 PR
It may help if they like you personally or if they're feeling your track but it will usually be dependant on your perceived market value.
Having distribution will definitely help your case as will some proven radio and club play.
PR is usually a long road with a lot of work going into any successful campaign so most PRs will expect you to stick with them and keep them on a retainer should you get signed.