HAHAHA! Wow you guys are great, I think one of my favorite moments is when you guys had that kid that auto-tuned in voice chat, and you guys tried to kick him XD. good stuff! You guys have plenty of talking in your videos and you cut out all the garbage parts which a lot of people don't. Your video quality is excellent. you guys could definitely use better microphones, but it's very entertaining regardless. if you keep it up and continue what you're doing you should actually get pretty far!
And you're right, I've been researching how to better thumbnail my videos. I've been working bit by bit. Right now I need to increase click-ability, and collaborate with others (working on collaborations presently).