Wikipedia:Don't create an account
You do not have to log in to read Wikipedia, nor is a registered account required to edit Wikipedia articles – almost anyone can edit almost any article at any given time, even without logging in (although their IP address is displayed with any edits made). Below are more reasons you might not want a Wikipedia account.
Summary of benefits
[Todo: add list of reasons not to have an account]
Benefits explained
Username
[Todo: add list of reasons that having a username sucks]
Reputation and privacy
You are actually more anonymous (though more pseudonymous) logged in than you are as an unregistered editor, owing to the hiding of your IP address. Honest users don't need to hide their IP address.
The privacy implications of this vary, depending on the nature of your Internet Service Provider, local laws and regulations, and the nature and quantity of your edits to Wikipedia. Be aware that Wikipedia technologies and policies may change.