ClickBank is simple to promote and simple to use as well.
However the biggest issue is that someone can easily stole your comission.
There are number of way to deter someone from doing that.
But it is still not full proof. Just ensure that you apply basic "deter" tatics to filter away some sale being taken away from you.
This is not a big secret, do a basic search and you will get tons of information about it. For someone who know the tatics, it is jsut a minute work.
Sorry, cannot depart that information here