If you're buying digital 64pp 80GSM A4 full bleed CMYK finished booklets for slightly north of £1.00/unit then your supplier is not making much money at all and IMO you'd be mad to contemplate bringing the process in-house.
- 64 clicks makes 2 x A4 64pp booklets
- you've said they are printed 'edge to 'edge' therefore they must be printed on (slightly more expensive) digital SRA3 substrate, instead of A3
- the sheets are then guillotined offline before being finished on a booklet maker with front edge trimmer
- you are being well looked after by your current supplier with the unit cost you're paying
- with a reasonable CPC and buying paper in volume from the merchants, your cost per booklet won't get below £1.00
- bear in mind paper has already gone up twice so far in 2021
- if you were to bring in-house, you'll also have these additional costs that you don't have with outsourcing...
- asset depreciation on the press
- enabling costs for the press (e.g. providing a new 32A radial circuit & isolator, floor levelling/base plate, etc.)
- finishing equipment depreciation (guillotine, booklet maker with edge trimmer/squarefold)
- suitable storage for substrates
- space (unless you are in the enviable position of having loads of unused square footage in your shop)
- I assume the job is digital because the quantities are small. If the quantities were into the thousands, then it becomes an outsourced litho job, which I guess you are aware, is a much cheaper process for volumes than digital.