I would never pay for any type of submission site. The fact is even if someone does check your stuff out, no one cares, because you had to submit to a sight. Your contract will look something like this: $0. The way to get attention is to generate buzz on your own, so you have something to leverage when negotiating.
Unfortunately the key to success in the industry right now is to never have played a live show in your life, have a marginal voice, process the hell out of your vocal, and cover top 40 songs including hip hop, but on an acoustic guitar or piano. This is the only way you will get to the top of any sort of charts. That or hacking. Unfortunately charts are pretty much the only places A&Rs look nowadays, as they are very busy wining and dinning. Not even kidding I have grown our Facebook following from 2,000 to 115,000 in a matter of a year, and not a single A&R has contacted me. I will tell you straight up no record label will make you successful. In general they are too busy with their artist that are selling well to invest in new acts.