Having said that, check out this interesting post. The sponsor is / was a student on benefits. The application was successful. Have a snop around the forum, as there are a few examples of some who have successfully applied and have been on benefits / low income.
Wow thanks for that. But it looks like he had 3rd party support :( Which I didn't have :( I have been looking around for someone who had less finances that me and who was on benefits on the forum who was successful to give me hope, let me know if anyone knows one.

It doesn't look like there is a set amount of finances for someone to have and its just done on merit and how the ECO is feeling on the day.