I have tried them but, like free joins or $2 one day trials etc I found this just de-values your content. Of course, it all comes down to VOLUME so for a bigger program (who probably isn't using CCBill anyway) it may be worthwhile, especially if their brand is saturated.
But for 'niche' sites, smaller Programs and sites, I always say never de-value your content unless it benefits you, and it usually doesn't. I much prefer to offer discounts for longer Memberships rather than discounts after the fact.
It will be interesting to see other Program Owners' experiences with this strategy.
