You don't want to spend the vast stores of cash it would take, and you couldn't possibly create an effective program to retain everyone. Remember that the old rule still holds true - 80 percent of your sales will come from just 20 percent of your customers. Keep in mind that holiday shoppers are an anomaly. The holidays cast a spell of impulsiveness on even the most prudent and restrained shoppers. The month of December is definitely not business as usual.
Patience is more than a virtue.
It will save you money and give you plenty of insight. Keep an eye on your holiday shoppers - look to see if they bought from you in the past, see how much and what they bought over the holidays and even track them the following few months. Look for patterns over an extended time period and then pursue the ones whose shopping frequency or order size looks the most promising. Segment customers into meaningful groups. Even the most lucrative customers don't all shop in the same manner.