Jane_Doe - 5:10 pm on Jul 26, 2012 (gmt 0)
I have a lot of sites that have had 90% or more changes in income (up and down) over the years but overall they even out. If I only had one site I would probably have less ADD but my income would have been much more variable.
I looked at the Ask The Builder site and it seems to have less ads these days and a decent Alexa ranking (top 100K). I do not know what ranking the site had at its peak. For awhile there it was mostly ads, plus the owner probably invited a lot of competition by being an Adsense success story.