As one who is a second admin on one forum and root admin on another, I can understand the retisence of making admins, but it can be handy some times if you are not able to go online for any reason, at least your site can be 'looked after' but there has to be trust otherwise it wouldn't work well.
What does make it hard is if you are admin and the root admin dissappears on you, and can not be contacted. This has happened to me. And as the site was failing for want of a root admins attention, I ended up starting up again alone. And I am pleased to say we are still going!
So there are good and bad things in any relationship, is basically what I am saying.