Also you can trust people on the internet. Not if you invite random people and promote them without ever getting to know them. But if you take your time yes you can.
Im part of a community formed around gaming where everyone has met through games and we have given money (real money) over to people in the group before. Most of the time its for when we hire out a place for a LAN party or whatever we send it over to 1 guy who will arrange it all. But we also send money as gifts when people get married have kids etc.
Now a lot of people have never met before, infact untill the first LAN we had no one had, we are spread across America and Europe. Yet we have taken the time to get to know each other to the point where we do trust each other, obviousely not everyone but hey there are always exceptions

And the level of trust involved in having someone look after your guild is obviousely so much lower. Finding someone you trust to do that shouldnt be difficult. The fact that every guild I have been in has had multiple people we all trusted to look after the guild shows its possible as well.
As long as you dont go promoting the wrong person for the wrong reasons you should never run into any problems.