Who knows honestly it may be a mix of proprietary "industry" information and/or various brands creating slightly different products. I have no basis to argue with the packaging but the store bought ones say like 90% thc and in my experience qwiso or the like is much closer to a solid than a liquid. Meaning more than 50% dilution. Now if you are doing large bho runs on whole plant material maybe the yield is much higher, as I have no experience with large cannabis industry processing equipment it is difficult to say. If you are careful with ethanol/iso extraction (filter paper, winterized vacuum or double boiler evap dust free) then use a little heat to facilitate mixing PEG400 that's the closest thing I've found to the store bought cartridges. VG and PG are bogus articles or are used for edibles or some different more complicated process, maybe used because of the nicotine vape industry. Ideally there would be no diluent/solvent but I don't know if people are doing that yet, it is unclear to me what this "cannabis terpenes" diluent is supposed to mean.