First, it's not the richest race that gets screwed, it's the one with the most powerful military. That's a not-so-minor distinction.
Second, CE only shuts down spying if every planet is covered, which happens rarely for a human player, and never (in my experience) for an AI.
Third, LOL:
I have no problem with alien races working together against a strong enemy to bring them down. But I do have a problem if they're able to do it in such a powerful way
You'd prefer the AI can work together against you, but only in ineffectictive ways?
The only part of that I can agree with is that not everybody getting CE sucks. That's pretty much indefensible, as CE is the best (not only) counter to spy spam.
And saving the best for last:
And why is CE so expensive?
You rip CE for being a "defense cheat" and then complain about it being
too expensive? It's cheating and unbalanced, but you want to get them cheaper and with a bigger morale bonus? There's something wrong with your argument.
Oh, and a preemptive "no, you're not" for when you play the "I've just been trolling for awhile now actually" card
yet again.