You are quite right! And theoretically they could even become invasive species here in the great white north because they can overwinter as eggs. The adults may not survive the winter but the eggs most certainly will.
Thanks for the info. I bet a lot of people on this forum would be appalled at feeding chams something like an E. Tiaratum. I personally never remove grasshoppers spiny legs because the chams can't get too pampered...:D