In one context your right, in another you're not. To say we're all "recasters" for recasting a screen used helmet is equivalent to recasting a 100% sculpt is not equivalent. To say otherwise is dodging the moral certainty that you're copying someone else's work.
Secondly if you don't like the price, don't buy it. Maybe you live in a low wage area like Arkansas where $20-$30k a year is average and you have plenty of free time. But someone else may live in a high cost area where grocery clerks make $14/hour and they have demands of family/kids. To them their time is worth much more, so to ask that they sell it cheaply is not a valid ask.
What is really comes down to is since we are all dependent on fans making kit, if the recasting hurts the prime prop maker it's a bad thing. If you recast a licensed MRCE for your own use, probably no one cares as it doesn't hurt the prop making community.