There are a lot of issues that go into commercial production. The content of the fabric is only the beginning. The availibilty of the fabric is a critical issue. You don't want to start with one set of specs and then have to change because the supply dried up. $2.50 /sqyd is not the final price for the fabric. Synthetics are usually woven to 60" wide which means a running yard of fabric is more than 1 sqyd.
Anytime you are dealing with commercial production you will need to deal with materials distribution. Some of those choices are best made by doing your own research and finding what fits with your business plan a nd ultimate goals. Once company may be able to get by with small end roll lots which are often not available on the retail level. Others might want to go with a full mill run from a manufacturing mill.
There are probably other forums on the net to research and resource this kinds of questions but I wouldn't know what they are.