I don't agree with the folks who feel we should be subsidising our pig-breeding. If any of you have been on Tony York's course at pig paradise he's quite vociferous on the subject. He wants breeders of good rare breed pigs to keep breeding - which they won't do if they're losing money on it. Of course we shouldn't be ripping buyers off - but we do expect to turn a (small) profit on our pig-keeping, through the sale of pork and of piglets. We are not wealthy enough to breed and keep pig at a loss - and if we were, we shouldn't: selling too cheaply would drive other breeders out of business. (Though if we factored in our time, even at minimum wage, we would definitely be making a loss!)
To keep a large, good quality gene pool going we need plenty of rare breed pig breeders.
Also, some "cheap" pure bred weaners may be a bad bargain. We bought in a batch of OSBs at a low price - and they never did well, taking much longer (therefore costing more in feed) than our home bred ones to reach slaughter weight. One of them also had erisipylas!
Caveat emptor