Hashtags To Be Registered Like Domain Names?

Here’s a thought: hashtags which can be frustrating to find, understand and keep together should be registered just like domain names.

• Conversations and groups could attach to an official hashtag, links to websites created.
• Standardised hashtags would reduce clutter (multiple hashtags on one topic).
• Confusion over semantics would be reduced, faster access/understanding of conversations increased.
• Purchasing a hashtag would increase the value for the owner of the hashtag.

How could this be a bad thing?