I believe most of the lower bowl seats are padded, so that is probably driving the decision not to sell to the public. The all plastic seats were made in the 60's and probably have all kinds of bad chemicals (known to cause cancer and birth defects in California) so they are off limits too. The Leed points are a plus. The yellow Riverfront seats ar being sold by a private individual so they can sell whatever they want. I purchased a bunch of seats from the old Municipal Stadium in Cleveland and I know they were covered in lead paint. I have one set of 4 seats left - for sale - $1000 firm.