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But if that was the case why spent money each month on a product was is then to be considered useless every month as i am to only check it every 4-5 months?

Like i get your point of guessing the weight of the box but each person that holds that box will have a better estimate of the weight yes? So in the same way each site will have a better estimate of DA?

So basically what your saying is that it is no big deal if any of the companies have decreased that it is an ongoing part of SEO as it will often fluxuate in line with the Google Algorithm?

As you can see from the following 3 images below that 3 out of 4 companies have declined in Domain Authority however one has managed to actually increase and stay up. Can anyone explain how this may be for the company that has stayed up has lost total external followed link and has only increased linking C-block domains by 1

uLTyDWz,QvBCoka,xT1rsod#2 uLTyDWz,QvBCoka,xT1rsod#1 uLTyDWz,QvBCoka,xT1rsod#0