While Twitter is still trying to figure out a revenue generating model (which will include Pro Accounts) for their hugely popular free service, some people claim they are willing to pay for certain upgraded features.  Dan Frommer took a look at comments on his most recent blog post about Twitter and put together a list of what Twitter users say they would be willing to pay for.

Amazing what people will “say” they’ll pay for…

• Slightly longer messages: 160 characters instead of 140.
• Unlimited or prioritized access to API. (Twitter limits how many requests an account can make per hour.)
• Auto-deleting deadbeat followers who haven’t logged in within a month.
• More reliable service. (Can’t really charge on a per-user basis for this though, unless there’s a separate Twitter that’s more reliable, right?)
• Link-click analytics. (Free already if you use bit.ly, though some limitations.)
• Guaranteeing that their old tweets (all of them) are available forever, and easier to sift through.

Would you pay for twitter fearures?