Apparently my last post was accidentally cross-posted in some alternate universe in which people are born without the mass of brain known for processing "rationality" and instead just have a giant impulse center that forces them to hit "Leave Your Comment" on every website they see.
Allow me to repost:
Question: "When your boss makes a sale, does expect her client to send her a gift?" [In other words, is the agent/client relationship a tipping situation?]
Answer: No, it is not a tipping situation. Gifts are not necessary. If you feel compelled to give one, it will be appreciated, but try not to send bulky or perishable items that will take up space in the office and/or go bad if the agent happens to be on vacation. Do not send food, as you don't know if the agent is vegetarian, vegan, kosher, halal, allergic to peanuts, allergic to gluten, diabetic, on TPN (intravenous feeding), or is fasting while sitting under a Bodhi tree to attain Enlightenment.
I hope this clears everything up.
(P.S. If your agent is sitting under a Bodhi tree to attain Enlightenment, he/she may be doing that for a while and you should probably seek literary representation elsewhere.)