You always has great questions.

1. Self Upvoting. It's OK. Everyone's upvoting value is limited everyday. The more you vote, the less valuable of your votes. So one has to use it wisely. If they choose to vote for themselves only, they miss out being part of other people's later viral posts, therefore, less money earned for themselves. It's a pretty democratic process.
2. I know nothing about Sia Coin. I understand my limitation about all the investment ideas, and I can never be a viral content influencer.

I am in the process of offering my own first ICO of my own startup, co-founding with some very influenctial people in the industry. Will let everyone know more when it's ready.