The problem is that CPQ and LPQ compete with each other; they should be made for separate level ranges. Make LPQ for level 70+, offering decent EXP for 70-100 (so it acts as an alternative to grinding), and people will flood LPQ.
Actually, the problem is a lot of people just prefer the easy way of levelling up, which would be doing trade wins in CPQ. Because all you have to do is AFK for 10 minutes when it's not your turn. Even though the EXP is not as fast as doing LPQ with a good party, people prefer it because it is just easier.
Yeah Maggles is correct. Nobody even trades wins here, they "free win". I went to CPQ here and people kept saying "FW" and I was like wtf does that mean? Turns out, it simply means you have a party of as many people as you can fit (up to 6 people) that wins all the time. Hence "free win". The opposing party consists of 1 person who keeps losing. Sometimes you have a high level player (~50) who doesn't care about the winning exp (since it will be smaller than killing mob exp for him) and he will volunteer to keep going in solo and losing. Otherwise they rotate the "FW" person. To get rid of this abomination, simply force the number of people in the party to be same, like in GMS. Only allow 2v2 or 3v3 or 4v4 to start.