Couldn't have said it better myself. There's this about team play:
1. Team play will provide extra profit.
2. Team play will provide extra risk.
How can you make extra profit? There are a couple of paradigms for team play.
One is the spotter method, with small players around the casino signlaing good counts. Another one is multiple players at the table with different jobs. One can be doing the Tens count for perfect insurance information. No matter what though, you have to be making enough to pay everybody and it is questionable if you can make enough extra to pay your team properly.
Now here's the risk. There is the matter of trust that Sonny mentioned. All you need is one incident with one player to destroy your EV. And you will have no recourse, except for the recourse that criminal type gamblers use which is violence. Do you really want to get involved with that?
Then there is the other kind of risk which is something happening to a team member. Unexpected things happen in the casino environment. The more people involved, the greater the chance of something happening to one of you and the rest will have to help him out. Even something like a car getting stuck on the highway, it's going to take away from play time. What's more, with the added money you have in play you are going to attract attention to yourselves exponentially. From pit, surveillance, and any troublemakers hanging around the casino. The troubles always come from the situations you didn't think of. This is why I prefer to stick with solitary play. It works and I'm already familiar with most of the contingencies that can arise.