In a perfect world, the $95 price point would scare off casual consumers, so hopefully someone who is in the market for repros is probably aware of the ROM hacking community and as such should be aware that these translation patches and hacks are provided free of charge on various websites (author's homepages, RHDN, etc). Those same savvy consumers would also be aware that a flash cart would provide significantly more utility. Therefore, only people who know this stuff is free, but just really want a plastic cartridge with an instruction manual will be buying the repros. I don't claim to understand the motivation, but I'm not going to knock it.
If the above scenario is accurate, then he is a jerk for selling the blood and sweat of others, but I see no real harm in it.
If, however, innocent people are being misled into believing the ONLY way to play these games is by spending $95 for a repro cart, he is an evil man taking advantage of uninformed consumers. I think the situation could be greatly improved if he would provide a disclaimer that the games he is selling can be obtained for free along with a link to a project page for each hack. Instead of making a $95 purchased based on a sensationalist tagline ("Think your[sic] good at Super Metroid? Now is your chance to prove it."), one could read more in-depth information about what the hack does, see a list of bugs, screenshots, etc.