I wouldnt' cut open chameleon eggs, myself. Because my desire to see them hatch outweighs my desire to see how and why they grow and develop. Now, certainly, I as a zoologist (I'm going to call myself that since I'm now laid off and I have a zoology degree...makes me feel better about myself...hehe. Besides, if I'm unemployed, but studying my animals, then why not?), I DO have a desire to open the eggs up and study their development at different stages (and with different incubation conditions).
It's just not that big of a desire. Besides, I only get one small clutch a year per female usually - that's not a lot of "spares". And I DO want to sell some, after all.
I had to cut open lots of stuff in zoology classes - including chicken eggs at various (and numerous) stages of development. Our lab TA had forgotten to "warn" us they the embryos of the late term chicken eggs woudl be "ah, ehm... developed", as she said - following a scream from one of the girls in class... oh they were developed.
Dr. Black, our teacher, had been teachign this class for decades. Someoen put, on her office door, a far side cartoon, showing Colonel Sander's worst nightmare - he's at the gates of heaven,a nd St. Peter is a Chicken. But they scribbled his name out and put "dr. Black in its plae. That's how many thousands of chicken eggs her class has gone through.
Science is not always pretty.