I have about one volume job per week most weeks of between 200 and 600 shirts with a large print. The rest of the jobs are short run jobs. Currently the volume jobs are either sub or screen print ( and a few solvent), but about half would benefit from full colour dtf onto a dark shirt.
For me that rules out a dtg printer. I am happy to let a roll or sheet fed printer chug away while I get on with other jobs and press the volume job when all the transfers are done.