As per usual, this does not receive a simple "very", or "not at all" type of answer.

A very few select webmasters have full access to our sites! These select few can update our sites (edit text in certain fields; add custom made, or edit, galleries; add content or request that we buy certain content etc).
I have given a very VERY select few access to check our & their sales through Paycom. I trust that they have total interest in our relationship because it is all about the bottom line, or profit! Only the truly pathetic pinheads can and would f_ _k th@ up!
Sure, some sponsors would be freaked at the mere mention of, but I have been doing this for years and I have yet to pick a bad apple.
*Smacking head on desk*
knock on wood

Trust is something that is earned, not freely given! Therefore, the truly mutual relationships (those I trust) I'll work closely with and I'll give all that I can because I know their and our best interests are properly aligned.
I expect/demand that they retort in a similar fashion --- they need something done NOW, I will abide, and the other party typically remembers/knows that I WILL ask and expect the same in return. Start feeding me BS, such as I don't have time, and we now have a standard sponsor-affiliate relationship (all special privileges have been suspended, or removed or worse ... account closed)!