I think BHB said he bought a snake for around $100,000 or some ungodly high number and never proved out. Most expensive normal he owns.
There are obvious things you need to watch out for, being they are WC.
The stress thing I'm not to sure about. The only scientific way to measure stress is through Cortisol content in blood and I can't find anything about it causeing anomalies. If you have information I'd like to see it so I can better understand it, hopefully its not just speculation.
Maybe Heather can help she work in labs testing stuff.