The old way still the best way
Business owners knows that people are online. That is why they have taken their marketing online also. This is the same reason why you get bombarded by pop ups or spam emails because there are a lot of people who want to market to you.
Being the trend nowadays does not mean that they are the most effective of all. It is said that the old ways of promoting a business can also be effective. The age-old tradition of mailing postcards is not as ancient and as ineffective as they seem to you compared with modern techniques.
Postcard printing is still one of the most effective forms of marketing today. Contrary to what people think, it is still being done and is serving its purpose well. The many development in how postcards are printed can attest to this fact. And with the printing technology that can do wonders with postcards, there is no way that people can ignore its use anymore.
They just choose to but tend to remember once they are in dire needs.