Im getting a lot of wins on the attacks I set at night. I'm also in California so the time difference probably works in my favor. One way to consider spreading the love - would be attacking randoms at night and friends by day. But the reality is, everyone should be getting plenty of attacks with or without neighbors. Its not like other events where you need to purge your inactive friends to maximize mutual value. I will say this - once all prizes are unlocked, I will exclusively send my nerds into neighbors towns with less gold.