Don't mean to sound like I don't believe you, but how can a 20l batch (that's 2.5 cartons) cost you $12 - $16 in ingredients? Hops alone are $10 for 100g and then malt on top is around $3 a kilo at bulk prices? And yeast would be at LEAST $5 even if doing a started, 1 packet of liquid $15 plus $20 of DME for starters is $3.50 per batch if doing 10 generations of one strain from starters?
Then sugar for priming, sanitiser, electricity etc etc.
my brew last week, bottled yesterday-
$0.15 ph 5.2 stabilzer - tsp
$18 Pearl, 6kg @ $3kg, (sack on special)
$3 Barret Burston pale malt 1kg @$3 (last of sack, on special)
$1.60 Voyager Voodoo 400g @ $4kg (crystal, on special)
$2.93 Dr Rudi 45gm @ $6.50 Hg (from 1kg bulk)
$0.18 Aurora 5gm @3.70 Hg (on special)
0.16 whirfloc half tab
$0.96 Dextrose 320gm@$3 kg (bottle primer)
$1.10 LDME 100g@ $11kg
Lallemand Nottingham recycle @10c (bending here, as full priced on the brew that the original yeast went into)
yeast nutrient was boiled old bread yeast (for 10mins) works a treat. wife freebie.
this batch all with flip top bottles, so no caps.
sanitizer costs so little that i don't add it, but let's call it 5c.
split the grainfather to 2 fermenters, so looking at 3.8 - 3.9% abv
total $28.30 divided by 5.1 ctn (46L/9L per carton = $5.66 ctn.
ok, no electricity - but the rest is there. and a simple ale haha.
hadn't considered it before, but yeah, little things like no capping costs, and that particular yeast is super aggressive, so 500ml each starter on a recycle still blew straight through the airlock.