My experience is that a monthly score of 3000 and anything above that will work on difficulties below superhuman (never dared to try that one, so I have no idea if this still applies there) to keep countries allied. Every now and then they might cease their funding for a while, but at least they usually don't sign pacts with the aliens.
The side effect of alien bases is a very high alien activity. So if you're not present in such a country, you're bound to lose it.
But like Cockroach said, you could see alien bases as much as an opportunity (to improve your score + quite some "spoils of war") as a threat.
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A sickened, sensitive shadow writhing in hands that are not hands, and whirled blindly past ghastly midnights of rotting creation (Nyarlathotep, H.P. Lovecraft)
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