I would think the lifetime price was set so low as to not offend those who can't afford to pay alot. We have some great members here who spend a ton of their time and resources contributing to dolphin via support but don't necessarily have the extra cash to layout.

By setting it so low Boonex is able to not offend those individuals but still deter the spammers/fake profiles and thus alleviate many of the issues that Unity currently faces.