For $200 you're getting a bag of wire.
Actually the CPK is a $200 box of aluminum tubing,
a bit of wire, and a 75 ohm coax feedline."Four 5-1/2 ft rigid counterpoise tubes form a square measuring 8 ft 3 in on a side."http://www.hamradio.com/detail.cfm?pid=H0-004303
The STR-II is a $160 box of wire.http://www.hamradio.com/detail.cfm?pid=H0-004038
You're absolutely correct in both being ridiculously
overpriced and something you can cheaply and easily
make yourself, especially a wire radial field.
Elevated or ground mounted.
Do they really SELL many of these overpriced kits?