I'm still not clean on this one.
With $nuserid in there, the list mail says that another list member has uploaded the ad not the actual user placing the ad.
With $User['userid'] in that location, several duplicate emails are sent to the list for each upload, but the name on the ad is correct.
I'm missing something somewhere. I'll sift through this thread again.
EDIT: I found my related issue on this thread...
Wrong username in Subscripton email