The other thing to point out to him is that this is your first litter.
Like all businesses things take a while to get established. As word spreads and your advertising gets noticed you will make more sales. Get some A4 posters printed up (you can do them yourself, they don't need to be expensive) and get out and about in your local area - post offices, vets, feed supply places, community noticeboards etc etc etc It's still just a wee bit early in the year for folks to be looking for thier own weaners imho. I always think along the lines of born Feb/March weaned May/June ready for slaughter November/December, so hang on and see what the early summer brings. Just remember to recalculate your prices to account for all the extra feeding. The only slight dissadvantage I can see with your breeding quality gilts/boars are they've not been notched, so
maybe pedigree breeders/showers would be put off that they couldn't show your pigs (it's only a maybe though, I might be being extra picky
)
Hang in there and fight him (nicely) on it !
Karen x