Hell, the x86 market might be cut throat, and cheap, cheap, cheap, but I tend to find more honest people in it then the Amiga market.
There are swings and roundabouts here. The PC hardware market suffers *badly* from cheapo, crap, not-well-QA'd hardware. It also makes it extremely difficult for new companies to get in on a market where a product (say a graphics card) has had a good few billion dollars poured into R&D then sold for less than $100.
Now if someone could design a card that cost $5 to make (all costs included), they'd have to be extremely stupid to try and sell it for $150 when it's a much easier sell at say $50. Anyone in business knows that it is far better to have 20 customers paying you $5 for a product than 5 customers each paying you $20. Word of mouth sales. Greater confidence in the market because more people have seen the product work.
The Amiga has a technical problem though (business/community/history issues aside). A big range of stock computers that haven't varied much over time. There isn't much incentive for someone with an expanded A2000 to start all over again with an A4000. So (for example) a network card can't be sold that will fit in all Amigas, so the size of the potential number of sales drops sharply.
I bet the price of that network card is justified. Justified in that it can't be mass-produced due to lack of funds, nor is there a reasonable-sized market to sell it to, or there might be an issue where not enough funding has gone into it to ensure it can be mass-produced cheaply.