I will tell you what I see a lot. There is a nominal rebate on recovered refrigerant sent back for reclamation. This fee gets eaten up by wholesalers in conducting the business of exchanging tanks, cleanup fees, etc. Then, these "costs" get transeferred to the contractor, who in turn transfer them to end users. As I sit here and look through invoices, i see charges for "one shot recovery cylinders". You say well, duh, why are you buying one shotters. Simple, the local supplier doent have enough tanks to go around, especially when some contractors dont want to pay fees for cleanup etc, and either leave the cylinders in their trucks, or on jobsites. They got tired of buying tanks, and only have soo many, so they push the one shot deals. roughly thirty five bucks. buy a tank, resell it, and hand it back to the supplier of tanks. eff all that time spent tracking this stuff.
Then sometimes tanks are available. there is the tank deposit, the tank cleanup fee (yes, i actually believe they cleanup every tank too, not), and the recovered refrigerant charge. Flat raters have nothing on this effort, so tracking the charges, deposits and returns etc is a pain. Scale your tank and tell me how much is in there, so i can bill you by the pound. Wait, isnt that your job? I already marked it on the box. But your refrigerant scale isnt accurate. So why do you sell them then?