Become at least a hero member here which means you successfully spent around 480 days on the forum.
It doesn't. Rank means nothing without reputation and a popular and consistent presence here. Anyone can buy a Hero+ account for probably $50 or so. If you don't have a lengthy history here with numerous trades under your belt then you shouldn't be offering to hold onto other's money.
The problem is that if you need people to trust you in order to gain trust, how can you make the first deal (i don't know if the point is quite clear here).
How do you become trusted in any situation? You build it over time. I think a good general rule for whether you're qualified or needed as an escrow is when multiple people start asking you to escrow their funds. If people don't already have that trust or faith in you then you probably shouldn't be escrowing.