Ending sponsorships

Thought that this was a really interesting (and honest) statement by Marco Arment, about sponsorships on his site:

They were always very easy to sell, staying booked solid for months ahead of time. But in the last few months, sponsor interest vanished, despite my traffic and subscriber numbers remaining high. I asked around, and they all said the same thing: they stopped seeing enough clickthroughs.

This is probably quite worrying for a lot of the Apple geek writers out there that make (or try to make) a living out of blogs like Marco's. I thought John Gruber might have linked to it, but clearly he is having sponsorship problems of his own: