How are PBE testers picked? Any skill required?

Just finished a game that lasted 57 minutes where our enemy just couldn't beat us. Our ADC left as soon as he gave first blood ( I was supp) about 3 mins in. So a 4 on 5, them getting 5 dragons and baron....and they STILL can't win. It goes back and fourth for that 57 mins with my team not wanting to surrender when we finally won a team fight and pushed for a quick win. We didn't have any dragons, or barons. Honestly Riot...if you have a team that can't win with a 4 on 5, 5 dragon and baron buff, what information are you hoping they can give you in a PBE environment? I think you should set a ranked requirement or at least something so you get players that can actually give you valuable information.
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