My idea is that the All Star voting woud somewhat simulate real All Star voting, where the teams often have ballot stuffing nights. So if you drew good crowds, your players would get some more votes.
I could see a couple of ways to involve individual teams more. Before all star voting began, each team could nominate five players (probably one per position). Bots would have 3 players nominated. These players would be placed on the "fans" ballot, and would accumulate votes related to how these players perform each week.
When you played another team, you could perhaps rate 3 of the opposing team's players. This would cause the "fans" to vote more for these players. It will also encourage owners to notice particularly good players in the conference.
And then I'd have one owner be the coach for each conference's team. He would have to use the 5 players that were named starters, but then he might be able to choose either the 2nd or 3rd place player in the fan voting, without being able to see their skills, and then maybe choose 2 others. He'd also be able to set the depth charts.
In some leagues, their might be discussion in the league forum about which players to pick.