Your point? ROHS is pretty much required everywhere in commercial products, but as you've pointed out, this isn't a commercial product.
And a personal or community driven project doesn't preclude open distribution.
This is not the US here, where you could sell a product "as is", i.e. without offering a warranty, or any service around it. We are here in Germany, and special precautions must be taken if you bring (from within Germany) a product into the market. "Consumer protection" has a much higher value here than in the US.
In particular, there is also a law against "unfair competition" which brings you into the danger when sellling any goods that do not conform to regulations for whatever reason. Any potential competitor could sue you for such an attempt, which may become very costly. A "call to order" is a well-known instrument of lawers here in Germany to "earn" some additional money, even more so as even the first "call to order" is not *for free*. IOWs, if some greedy lawyer finds a page where a product is sold without all necessary regulations in place, this may become an expensive experience for you.
The simplest you can do is not to sell it as a product, but a small private series, as a hobby. As soon as you announce it on a web-page and make it accessible for everyone, you are entering a rather delicate terrain, so it's not done.
I'm not talking for anyone of a1k here, this is just my private statement, and I'm not a lawyer either, this is just my "common knowledge" and experience of what happens over here. I understand very well that such precautions are necessary, and I believe they are very much due to legal reasons rather than to stop anyone from buying the board (not to call it a "product" because that is something it cannot be).
This whole "only for our members" nonsense is childish.
"This is forbidden by law..."
Obfuscation, plain and simple.
No, you do not know German law, and German lawers in particular. Please understand. It's not the US system here. Registering on a1k costs you nothing.