Originally Posted by hybridservers
I absolutely agree with you. Many people just throw away this kind of letters and don't read anything. If they are already their clients they are already interested in your services and they don't need that, it is worth sending letters for people who aren't your clients.
For your clients I offer to add news overviews with invoice
This could not have been more shortsighted.
A lot of companies make more money with existing clients. By informing them of new services, value-added features, they take advantage of the client base that is already trusting you with business and their money.
For example, if you start selling SSL certificates, for example, what is the likelihood that your clients will buy it from an unfamiliar third party instead of a company they trust and the one they've been very happy with for a long time?
Most companies would consider that it is not enough to just acquire a client. You need to not only retain the client, but also sell additional products and services in the long-run, maximizing your revenue per client.