I don't think he's too worried about making a profit. The deals with Samsung and adidas will help offset some of the costs. With adidas marketing Chelsea apparel, I'm sure the club will probably see more revenue from outside England, which will be a bonus. Plus, he's stinking rich, breaking even on the club would be just for show.
That said, I don't think Chelsea is really after another midfielder at the moment -- they need a striker more than anything. Midfield is pretty secure.
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"When I look to this lion it looks arrogant, it is aggressive, it is powerful. He is proud of being a Chelsea lion." -- José Mourinho