I'm really glad you brought this up. Thanks, yar! XD
Firstly, the Omni would be better served simply by not only having enough money to continue to rent without the fear of losing the building, but also to accumulate funds to eventually purchase the building ourselves. Furthermore, with an influx of money above the bare necessities, we can invest on the building's infrastructure, make it more accessible to people with disabilities, general building maintenance, etc.
Secondly, if we had more money coming in, we could help each collective on their mission by helping them financially to remain here (assuming their purpose/values are in line with the Omni's, of course). I'm not sure of the needs/wants of all of the collectives but if there's money coming in, collectives doing good won't have to be pushed out because they can't pay rent, anymore.
Thirdly, by having great collectives that continue to thrive within the Omni, it does Oakland in general a great service by providing food for the homeless, science/technology education, arts education and social work. All of the collectives prospering not only benefits the Omni and it's regulars, but also the community as whole.
I know I'm just an Omni noob, but everyone I have met here has been great and are doing amazing community work. This makes me passionate about seeing it thrive and not just whither away.