Cancer Survivor turned practitioner.   
It's RARE that I vomit with Kambo, and it's getting even more rare for those who sit with me to vomit as well. I do not believe every Kambo session has to involve the aspect of purging into a bucket. I know many many practitioners who specialize in "Dry kambo".   
I sit frequently with 1-3 gates depending what my body asks for.  I sit to ensure i have DRS-B2 peptides in my system (anti cancer), I sit to ensure i have Dermorphin peptides in my system to reduce the pain from the surgery that removed 2/3rds of my right hamstring,  the nerve damage and radiation damage from treatment.   
I ALWAYS test the strength of the sticks I receive before serving others... as not all sticks are harvested equally.. especially when coming direct from the jungle :p  
I say this because of the post above. I've seen so many people on various forums blasting the use of Hape, due to posters own trauma and beliefs' around tobacco.  
I'm a daily, multiple dose Hape user as well. Why? It helps me with my "Chemo Brain" that I'm still recovering from. Hape contains Alkaloids that simulate nervus regrowth, and the mental "Reset" is needed when I need my ADD and or "Space brain" kicking off without needing to take a pill.