If you take all setup costs into account we have made a BIG loss. If you take the pigs batch by batch, some we have made a loss on (particularly when we incurred a £100+ vet bill) but increasingly are returning a modest profit.
The key is not to pay an excessive amount for the weaners, we pay around £315 / tonne delivered for feed and in the region of £40 for slaughter and butchering. (Sausages and bacon cost more).
I track ALL the costs whether it be fuel to collect weaners or to collect feed (if not delivered), bedding, feed, slaughter and butchery plus packaging etc.