How much adsense earnings would you be happy with on a monthly basis?

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I use google adsense on my website and blogs, but I also use adsense sharing sites such as xomba and hubpages. My adsense revenue has increased this month as a result of more participation on Xomba. I wish my adsense earnings were higher but at least they are starting to increase month by month. I would be happy just to reach payout every month. How much adsense earnings would you be happy with?