There is one reason to care: getting listed in a regional Google
(Google.uk, Google.ca, Google.de, etc., etc.).
Getting listed (or at least ranking well) in a regional Google requires
one of the following:
1. EITHER a regional domain name, such as yoursite.co.uk, yoursite.ca,
yoursite.de, etc.
2. OR hosting in the region in question, in which case you can have any
domain you like (yoursite.com, yoursite.net, yoursite.org,
yoursite.info, etc.)