It is not normal to have positive camber on the car. "More" positive than stock specs is fine, but not "actual" positive camber. I forgot what the exact specs were, but the front on the F30 should be about .3 negative camber. Lets say that you have .2 negative camber... then it would be "more" positive than the OEM spec, but not actually positive camber. If you can not adjust the camber to be negative, then something else is wrong with the suspension and needs to be adjusted.
When I installed my H&R Sport Springs, I eventually got it aligned and the numbers showed that my camber in the front became "more" positive than OEM specs, but was still within the tolerance of good enough. It was .2 or something. Regardless, I thought it was really strange because I figured that lowering the car would give you more negative camber.