Price-discrimination is such an important tactic for online retailers. If you promote your goods via a number of channels this will help you towards maximising profits as you can charge more in some channels than others due to the varying demographics of their users.
Another reason to price discriminate would be due to the different charges and fees each of the channels may require you to pay per sale. If this is the case you may not be able to price at the same level for your own website as a given channel. You will need to check the terms and conditions for these external service providers for specific rules about own-site pricing.
You may also like to run short-term marketing campaigns to encourage the sale of certain items. You may like to begin that campaign on your own website to build links and social shares and then follow the pricing-strategy onto the channels shortly after and this feature of Cloud Fulfilment gives you the option to do that.