Pressing is usually outsourced to big operators, as the previous reply said - the costs of the equipment are in the millions bracket.
However, what there may be a market for is automatic duplication on CD-R or DVD-R. There are machines that will burn somewhere between a couple and a few hundred discs, including printing, in an automated fashion. Is there a market for that kind of service? The equipment for this comes with a much more modest price tag, somewhere in the few thousand price bracket depending on exactly what you want to offer.
This kind of equipment makes sense for short runs, where the fixed costs of pressing (such as the costs of the glass master) aren't justified.