I'm going to go back to my OP and suggest that part of the Rays attendance problem is that they don't pay the big bucks for the big names. I do think the Trop (which I have never been inside of) is the worst ballpark in MLB. But this year the product on the field is absolutely superb, the very best in MLB.
I've been to Camden Yards several times. It's terrific. But the product on the field, combined with the Washington Nationals (and their new park) proving to be a good draw just 38 miles away, has seen attendance go steadily down.
The Orioles product right now is pretty good and the Nationals stink. So far the Nats average 21,285 and the Orioles 21,181.
When the Nats were the Expos in Montreal, the Orioles attendance was 34,344 in 2004. They went 78-84 that season.