I've made this comment on the issue on an OMGubuntu article:
"Shopping should have it's own lens, making room for other shopping related scopes to integrate into it later (like newegg and whatnot).
And I personally think that the home lens should have access to every scope in the dash, but which ones it displays should be optional and easy to configure!"
This would avoid the cries of horror from those who believe canonical are giving amazon the ability to somehow monitor all of our searches. Somehow...