Most of the advice makes sense, although we were surprised that tipping delivery workers (equipment rentals, cakes, flowers, etc) was expected. In many cases you won't even see them, since you'll be busy getting ready while your venue is getting set up.
Also a little surprised that tipping bartenders, wait staff, etc is expected, since they typically are paid a rate where tips are not assumed to be part of their compensation (unlike restaurant wait staff, for example, who are paid a couple dollars an hour in salary,with tips assumed to make up the bulk of their pay.)
In the end, you should do what feels appropriate, but the advice from WABC should at least give you food for thought.
