You must not be using popular services like Gumroad, that also withholds your money for a week. Or Leanpub, that keeps it for 40 days. Ironically, someone on Game Jolt was recently using us as an example of marketplace that pays creators instantly (turns out they were using the Direct To You payment method). Everyone keeps your money for a while, it's an absolute necessity in order to handle refunds and fraud.
Delays in actually sending the money once a payout becomes available and is requested, those are another story.