Well it is faster than you can ever imagine. I had a course and a great book about the costs of switching systems and the lock in strategy from Carl Shapiro ( the book is Information Rules )
Get your data from other popular online stores, bulk upload them and synchronize multiple sites in one or two clicks.
This will give you a product that I will call the best Switching Cost Killer but many others will call it GOOGLE BASE COLLECTOR
As many of you have already realised that we stick sometimes to one and only one system, it can be the easiest system or it can be the first one we got used or introduced to it. But, you may notice as well that the more you stick to a product,system or service, the more obvious it became difficult and costy to switch for another one.( just like our friend Seth )