Does not pay for you to buy a brand new aluminum tank for $100+
At some time during your tenure with this hobby, the C02 tank will get swapped and you will end up with a dirty steel tank.
I use to go to Clinton on Jericho and insist on waiting for a refill but somewhere along the 10 years, either they did not do refills or I wasn't willing to come back 3 days later + you save yourself the fee when your tank test expires since you continually swap tanks that are inspected already and good for a few years.