(1) I have been pouring my own plastics since 2010, and it has paid off big time for me (in the long run). In the beginning, you spend a lot getting all of your equipment (see below for a breakdown on pricing (give or take $5 depending on where you purchase it).
I have five (5) 5.25" Senko style molds (each is 5 cavities, injection molds) - $73.50 each
Calhoun's Medium Plastic 2.5 Gallon - $74.50 (my senkos last between 2-5 fish with a 3/0 hook through the top)
I have a large injector, medium injector, and a dual injector for laminates - I don't know the exact amounts on these, but the medium injector was around $50 (Large is probably $70-$75 and when I purchased the dual injector is was around $100)
Gloves (ones that can withstand heats of 300-400+ degrees if you get plastic on them) I use Hot Mill Gloves which can withstand 450 degrees ($5.50 at Bear's Baits - these are mainly for injection molds)
Eye wear and a painters mask are highly recommended. The plastic burns at high temps, and releases toxins which are hazardous
Pyrex cup (preferably a 2 cup size)
I have probably a total of $2,000 in everything that I have purchased over the years. I am doing this as a hobby and for me to have an unlimited supply of plastics. I also have craw, tubes, lizards, frogs, grubs molds which can run you anywhere between $50 to $150 per mold (depending on what you want).
It's a big initial investment in the beginning, but to me, in my opinion, the risk (money spent & time) has well been worth it.
(2) I just poured (on Saturday) 50 blue fleck with green glitter (.015 size) with 1.5 cups of plastic in 20 minutes. I can pump out 25 at a time with my 5 molds. I have poured as many as 500 baits in about 5-6 hours. I work overnights, so the night before I go back in, I stay up late and pour plastic.
(3) I had purchased GYCB back in 2008, and went through a ton of them. I was spending $50-$60/week just on senkos. I decided to pour my own. The plastic I use seems to be a little bit stronger, but can also depend on how hard the fish hammers it. My avatar shows my senko from a local pond.
If you're interested, I can send you some of my plastics I have poured. Just shoot me a PM, and I will send them out on Thursday or Friday (my weekend).
Hopefully this little bit of info help you out some.