there are lot's of different points of view on this. Some people never send bonus sticks, others always do. I have traded with several people here who never ever send bonus sticks, although they always say they will and are grateful to get yours. Personally, I always do, but I realize it's not required. What is required is that you live up to the spirit of your agreed upon trade. Anything you do as a bonus is a gesture of kindness and a window into your personal generosity, but don't necessarily expect reciprocation, you may not get it...on the other hand, you might get bombed. There is no real etiquette proscribed for it though.