My company just bought a new machine. I think it was near $50K, and a mold would be another 10-15K. Then plastic pellets, to get a good price you would want a
Gaylord or 1500 lbs at $2-3 per. You will need tooling to set the mold (forklift or cherry picker), you will want to pad some money for maintenance, hydrolic fluids and oils/greese, mold cleaner, ejector pins if they break. You will want hopper drier and all it's filters, an air compressor for the drier and for blowing off chutes and machines. You will need 440 power as well. then you need chiller/mold heaters to cool on half and heat the other on the mold, this is for setting up and to make sure it sticks to the eject half. Then run the thing and you will need someone there to catch parts unless you invest in a robot arm (we have them but they are fidgety things to get working but they do run consistent. Then buy packaging and start shipping to customers...well after you advertise and market that you have them and try not to get sued by GW.
But after all that, yeah, you could make some money eventually.
Sorry, couldn't resist... I have to do costing on plastic parts every single day here.