I recently went to the holocaust museum and can't help but wonder whether there was a high suicide rate amongst staff at concentration camps - it's not a something that I've heard much about.
Whilst I have never seen any statistic on the suicide rates of the SS personnel (and towards the end of the war the Auxiliary-SS) concentration camps, it's worth noting that concentration camps had a higher rate of turnover in regards to staff across the board; even the head of Auschwitz-Birkenau Rudolf Hoss was transferred from the camp in 1943 only to be reinstated in the middle of 1944 to ramp up operations there^1. In a way this made tracking perpetrators much more difficult, as many of the staff of the camps were posted in far away places (usually on the Western Front) such as Italy in logistical roles, where it was less difficult to go into hiding once the war was concluded.
Another interesting statistic, although the practice was more common among the Einsatzgruppen where the troops and auxiliary's were given extra alcohol rations as a coping mechanism, was a high rate of alcohol abuse among those working in the Final Solution program, although again more common among the task groups towards the front who had to do the killing either by firing squads or mobile gas vans, before the camp system fully took off.
And whilst we don't have many statistics on the SS staff themselves, part of the reason perhaps the rates are not as high or perhaps not as known as their sister Einsatzgruppen organization was the fact that, in Auschwitz at least, about 120 SS staff oversaw the running of the gas chambers and the disposal of the bodies, the bulk of the work was done by Jewsih prisoners known as the Sonderkommando (Special Squad)^2. These prisoners guided people to the gas chambers, and moved, looted and cremated the corpses and as a result were housed in a different part of the camp and were treated better. Many of them committed suicide due to the natural horrors that their work invoked; those who did not were shot by SS guards in the space of a month. Almost none of the 2,000 -2,500 of the Sonderkommando personal survived the camp's duration.
(1. Jozef Boszko, Encyclopedia of the Holocaust 2. Sybille Steinbacher, (2005) Auschwitz: A History)