Lost promos due to afks

So I know how dumb these threads are, but this is getting ridiculous. I just got into promos for gold 3, and first game starts. Mid laner afks after 10 minutes. Okay, so what? We end up winning the game 4 vs 5. Awesome. Next game. Start playing. Mid laner gives up first blood, then quits the game immediately. We surrender at 20. Oh well i have another game to get promoted. I stop playing for the day since the bad luck. Next day I queue up for ranked. Guess what happens. After our support gives first blood on an invade, top laner afks. It's getting out of hand. Players who are sitting at 50 lp with nothing to lose don't care at lower elos. They just afk any time they don't get their way. I'm at the point I don't even want to play anymore since there's no point. If there is an afk in 25% of games, regardless of team, do I really deserve to gain or lose lp?