They definitely do it around Black Friday, and usually around the end of July (I believe the anniversary of the public release back in 2008), my last two subscription purchases were 2 years ones for $89 around the end of July (2012 and 2014).
Rookies can be/will be messy, which puts some people off, as does the general feel of the sim (very Papyrus so GPL/Nascar 2003 feel), but yeah certain series like the Skippy are *generally* good races and 'go official' (8+ racers iirc) at pretty much every time slot, certainly all the 'normal' uk ones of evening/weekends. Other series are far worse in terms of participation for various reasons.
Rookies can be/will be messy, which puts some people off, as does the general feel of the sim (very Papyrus so GPL/Nascar 2003 feel), but yeah certain series like the Skippy are *generally* good races and 'go official' (8+ racers iirc) at pretty much every time slot, certainly all the 'normal' uk ones of evening/weekends. Other series are far worse in terms of participation for various reasons.