The importance of securing new business for future growth is vital. However it must be matched with the effective management of existing clients. The consensus opinion seems to be that bringing in new accounts costs between 3 to 10 times the amount it costs to renew an existing account. So, it makes economic sense to look after your clients.
As well as the clear economic benefits of retaining clients, using webinars to keep your clients happy guarantees a good reputation which in turn will help bring in new business. The more philosophical among you may call it a virtuous circle or Karma! Whatever you call it, it works!