Lower Stats Early in the Month?

[DomainFatigue]

I have noticed something strange with my sedo account. The first few weeks of the month the traffic and clicks are always the lowest. Yet with my sites using Adsense this phenomena does not occur. The traffic and clicks are fairly consistent throughout the month and sometimes my revenue is higher early on. Likewise with the few domains parked at DomainSponsor. Why is it only lowest at sedo? Has anyone else noticed this?

[Welkin]

Yes, it's the same for my domains at sedo. Maybe not every month but generally...
Maybe since sedo interpolate the ppc, they start with lower payments and as the end of a month approaches and they see how big is their profit from us, they "gratefully" increase our earnings a little bit.