Why do i have to pay for certain apps on my jailbroken Iphone 5?

I have a question i jailbroke my iphone 5 using evasion and its great and all but for some reason I have to pay for certain add ons and apps one add on I want is zephyr which lets you multitask windows fast or something like that and it says I have to purchase it for 4.99 on cydia, now i've tried going to source and adding a source and typing the hackulo url but it does not work so i'm wondering is there a way around this and not have to pay for these add ons?

Some cydia tweaks need your pay, still there are many free ones
like http://iphone.pandaapp.com/news/03042013/045022958.shtml

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