5 excellent reasons to jailbreak your iPhone
Summary: Looking for a reason to jailbreak your iPhone? Here are five fantastic apps--apps that will rapidly become "must have" apps--that you can download and install onto your newly jailbroken iDevice.
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Nitrous
This is the app with the simplest user interface of all the ones I've listed here, but it does something that is literally priceless—it gives JavaScript a massive speed boost.
Apple's Nitro JavaScript engine is restricted to apps such as Safari and iBooks, but by installing Nitrous, any app that uses the WebKit engine is given access to Nitro. This means that third-party browsers such as Google Chrome benefit from a performance boost of up to 300 percent.

Price: $0.99.
Source: Cydia.
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Talkback
One More Thing...
For unlocking
i think the main reason is slightly less noble
Not necessarily freeloaders
While I am not a jailbreaker myself, I can see why tinkerers would like this.
nope!
Grammar
LOL Dashboard X - live widgets
Possibly fun - not useful
Otherwise, they are a waste of time.
Not convinced
Loyal Apple Users Will Not Jailbreak
http://www.zdnet.com/why-do-iphone-and-ipad-users-jailbreak-freedom-7000011114/?s_cid=e004
Wow...
there is only one reason
Not worth the effort
Jailbreak 6.1.3 released