Your biggest problem with getting everyone to use "escrow" is the fee. Quite a few users would rather take the risk and save a dollar vs paying a fee and being safe. It's stupid and a huge mistake.
It's the same cycle with everything to do with money on this forum. You see it with trading, signature campaigns, gambling site wd fees, bitcoin transactions, and anything else that might cost an extra satoshi.
Users don't look at the risk, they just look at the bottom line. How much money can or will I put in my pocket?
Honestly, escrow fees are mostly reasonable and probably too cheap really. Some deals literally take hours to complete and an escrow is making pennies for all their time.
The last biggie was Master-P, I think. For the most part certain members can be trusted, but you just never know. But OP, I think the scamming is going to keep happening no matter how many warnings people get about using escrow.
master-p got me for 2+ btc when I was using him to escrow signature campaigns. I'm sure this type of situation has been read by users in the past and steered them away from escrow as well.
The forum runs interesting facts, funny quotes, hints, info, and ads given away to supporters to the unsold ad slots, then why not use this same technique for the said awareness campaign. This way, at least the forum is alerting the naive members and if they don't consider to be safe then they deserve what they deserve. The forum can reach more peoples than us by using its resources.
I think using unsold or reserving 1 ad slot for education would be an excellent idea.