I tested the stub. Lights up AV scanners like a christmas tree... but thats just the stub. So basically its just normal trojan (not sure if the name spyware is correct) you can buy for $50 and then you still need a separate crypting service so that AVs wont pick it up. You will also still need a method to deliver the malware. The crypting and the delivery are are the harder more expensive parts to this. Crypting is an always ongoing battle against the AV vendors so a crypted stub will most likely only last 2 weeks. A lot less if you are doing mass spreading instead of specifically targeting a few individuals.
The delivery is the hardest bit of this. I wonder if that spyware came with awesome delivery methods to warrants its cost?