Because this is my first month on clickbank, i dont really know: how are clickbank sales during the Christmas time? good? bad? what do you think - should i increase advertising, or slow down?
It really depends on what you are pushing, certain products will indeed experience an influx, you'll notice many publishers doing specials/promos/discounts etc. other products totally die during the rush. The best things to promote during this time of year is actually not digital products (shh). Ebay, retail, electronics and tangibles do best imo. Merry hoho!
In general, I'd say Clickbank's best time of the year is Nov-March... though NCMedia's comment about physical products is also quite accurate too -T