I think there are some +'s for treaties (economic and research) as well...?
Yes, yes.
Our Treaties Together(+/++)
That makes it 13 positives to 17 negatives.
>>I'm talking about a 10 to 1 ratio of your military ranking to theirs. <<
If you are so far ahead in miltary, why would you bother with an alliance?
An ally:
1. Will not get angry if you station your military in their star systems.
2. Will not get angry if you are destroying their empire through cultural conquest.
3. Can be spoken to any time(no 'too busy - try back later' messages).
4. Will provide a decoy target if some more powerful civ attacks you.
5. Will not charge as much for techs, ships, goods, or services that you buy from them.*
6. Will give you small gifts from time to time.
*I'm not too sure about the 5th point, however.