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That's not exactly right. 1 share gets you a weekly portion of the pool, based on how many total shares there are. We divide your weekly portion by your own posting pattern and that establishes your per post upvote weight. If it's too low to deliver, we slot you into a pool with fewer shares so that you will get your upvotes.

Here is a post with more on those mechanics:
https://steemit.com/basicincome/@steembasicincome/steem-basic-income-membership-update-pulling-back-the-screen

This will all be streamlined in the future as we move into full automation behind the scenes, and we will explain the changes in detail at that time.

Thanks for the answer :) Let me know if need help with automation, I have some skill in python-steem. Cheers!