The delay is artificial, and it's there for a reason.
Yes, and thats to prevent PM spam from 1 post wonders.
I don't see how lifting or reducing the wait time for established members ( ex. if post count > x ; no wait time) would cause any harm.
In my humble opinion, I would say that it's there to prevent PM spam. Period.
It's not very hard to raise one's post count to x if one is planning to PM spam a $497 piece of software (or even a $10 plugin for that matter, since one will be reaching out to thousands of members).
From the work I've seen the staff put in, I believe it will be very difficult to spam 1k posts in a short amount of time without getting the banhammer.
Post count spamming is easy to spot.
Post count > 1000 + X years of membership + implementing a wait period if PMs exceed XX amounts of PM under an hr should be reasonable measures that likely won't result in PM spam.
Sorry, only staff are able to send messages and search without being throttled. As stated above, it's a spam counter measure and serves an important purpose.
I'd suggest using an alternative method of communication for you and your customers (assuming the need to send quickly is sales related).
Would a 15-30 second limit be out of the question for jr vip, or exclusively for jr vip who open a BST? (i don't know if vBulletin could even make this distinction)
BST providers might have to respond to a bunch of PMs, and if they get 60, their minimum wait time to get through them is an hour.
I always wondered what server load in regards to PMs is. I wonder if a forum could be knocked out sending a bunch of PMs with no time limit.