That's right, it doesn't cost Paul anything except a couple hundred dollars to CUSIP to change the number.
Normally, the costs are racked up with the transfer agent -- having to buy new certificates, etc. But in this case, it appears Madison Stock Transfer is working alongside Paul with his tricks. In fact, they have the same lawyer I hear.
Transfer agent also makes money when the brokers send in the certs. for exchange, the brokers usually pay abour 420/25 for each cert.