Are there some mathmaticals odds on growing variegated citrus from seeds? Furthermore, do the odds change when using store bought fruits for seeds? I know this may seems stupid, but every fruit I eat, I consider trying to grow the seeds and I'm wondering what I face.

Most variegated varieties were discovered as bud sports, not seedlings. From what I have experienced a bud sport has much more stable variegation than seedlings. I have had many seedlings come up looking like they will have great variegation, just to have them revert to green a few weeks later.

Thanks, I'll keep that in my head when looking for trees.