I'm not sure how Alexa should effect your decision of putting AdSense on your site? Put AdSense on your site when you have a steady amount of subscribes/readers and a nice amount of daily traffic (in my opinion)
You`ve been losing daily income for quiet some time now. You got a chance to earn even if you get 5 users per day, so why give that away and wait for above 500 users?
I usually wait until I am getting around 500 visitors/day. Let the site/forum grow for a while first... Ads can be distracting and of course cause visitors to leave your site... which is not what you want early on... At least that is my technique! I've written more on the topic at my blog: http://sockmoney.com/2007/07/when-is-right-time-to-put-ads-up-on.html
Didn't say how much you'd earn.... just that you'd 'earn'. I have a site that I just started that only gets about 2-5 people a day. Every few days I get a click here or there. I would probably get a heck of a lot more visitors, especially in that market, but I think I over optimized the site for a few set of keywords, causing me grief in the serps. Must fix....
I usualy ad adsense from the beginning. Just watch out because google love to ban site that dont make much money.
I say put them on at the beginning. If you add banners and such after you get a decent amount of people visiting, they tend to dislike an addition of that nature. That's been my experience anyways.
Depends on what your site is about. If you are selling products or services, you might want to think twice about adding adsense ads on it since your competitor ads will show up on your site. If your website is all about giving some information to the user, I would say it is never too early to put some adsense ads on it. It will help you earn a few bucks a day to help pay the bills.
Page impressions Clicks Page CTR Page eCPM [?] Earnings encoder 168 3 1.79% $5.06 $0.85 ripper 168 3 1.79% $5.06 $0.85 converter 173 3 1.73% $4.91 $0.85 multimedia 173 3 1.73% $4.91 $0.85 audio 173 3 1.73% $4.91 $0.85 point of sale 31 2 6.45% $4.73 $0.15 POS 31 2 6.45% $4.73 $0.15 point of sale software 31 2 6.45% $4.73 $0.15 sale system 31 2 6.45% $4.73 $0.15 point of sale system 31 2 6.45% $4.73 $0.15 anti-virus 167 1 0.60% $0.74 $0.12 security 167 1 0.60% $0.74 $0.12 secure 55 0 0.00% $0.00 $0.00 anti virus 55 0 0.00% $0.00 $0.00 virus 57 0 0.00% $0.00 $0.00 This is my earning data, why my total earnings is just $1.12??