Fair point, but I still think it's odd.
I mean it certainly doesn't fall squarely under the "already possess talent, skip it" rule, but it easily could.
The cost is low but that is an argument both for and against I think. They're cheap so why pay? It's pointless basically. On the other hand, they're so cheap that why not pay, its not like 5XP is that much... although it's still 5 wasted XP...
Ah well, we'll see if they ever replies to my email. I doubt it somehow.