I think you are really undervaluing what is being offered, and by the sounds of it the request for training is coming from professional organization, not some one who is doing a small hobby on a Wednesday night at art class.
I am in Australia and listed below are some courses and there costs
ESRI 2 day course: $2,200
AutoCad Beginner 3 days: $3,695
AutoCad intermediate 2 days: $2,495
So if you are looking for an hourly rate, i would up it to the $140 to $160 mark in Aussie dollars.