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Not much, but I haven't crunched the numbers recently and nor have I been bothered when we dipped into my savings over winter. It ebbs and flows, but I've turned off all affiliate and advert stuff, so we're 100% reliant on donations. Costs vary, about £500 per month on average, and then a couple of annual costs that add another £500.
Most people donate in the £3-8 range, some in the £10-20 range, and a few do random donations of £50-100.
The real risk is typically just the slow expiration of card details, or changing banks, or someone not having money that month and the payment failing and then it stops the subscription... It's the constant small erosion of income that eventually bites, as it's not like I push for money or do funding drives.
So as long as a pot is rattled occasionally this are fine and it's not really an issue.
Obviously sucks that yesterday we'd already paid this month's bills and then I basically spent most of that figure again in temporary servers... Running with 1 month spare cash in the bank was quite good considering 6 months ago we were in the red - though I didn't say anything because it's seasonal and just recovers usually.
Bearing in mind the number of members of the site how much would each person have to donate per month to keep the lights on?