Salaries are very hard to pinpoint since there are so many subjective considerations (house show revenue, merchandise sales, PPV appearances and buyrates). Your best bet is to try search engines, I think some people here are starting to get annoyed with all the threads asking people to look up facts and figures for them rather than discussing issues in wrestling.
I must agree. Is the opener the main-event? No. But it's still (usually) one of the more important matches on the card. The 2nd match on the card or the match in between main-events are the real death spots.