I would like to add few more earning methods from my end:
1. Services:
In this section, members post bounty options for those who can help them either in programming or any other task (eg: a signup on a website, forum posts and so on). This job can get a person earning irrespective of his account rank.
2. Digital Goods/Goods:
Here the members can sell their digital goods like gift cards or physical goods and earn BTC. A simple a safe method.
Also in the Faucets section, kindly write that it's a low earning method. Also if possible, rank the options as per the earning capability. I feel Signature Campaigns pay higher than the other options but that's my POV.
Would you recommend always using escrow when selling gift cards and other goods?
I would say always use an escrow when dealing with trading goods and services on marketplace. There are way too many people out there who would love to take your hard earned coins. Personally I would suggest SebastianJu, because I have personally dealt with him and does a quality job making sure everything goes as planned.
Also if you're looking at just selling gift cards I would take a look at purse.io as well, have heard good things about the site.