my income fluctuate like 4-5% each month.. but if i do not update everyweek, yes, it tends to go down along with the traffic.. because the more quality content you have, the better chance your site will be searched for. try building links and organic searches.. I build my sites for organic searches.
Mine always increasing and I NEVER wasting my time to do link building, what I do is create good contents.When you have quality content linkback will come easily without you are asking.
Yes...You may say that my earnings from google adsense is stuck at big 0 (zero) since I do not use its service on my blog. lol Regards, RightMan