Yes, it's not cheep, but let me explain why:
Silicon for 1 mould: app 50 EUR
This mould can produce anything from 10 - 20 pcs before it is worn out
Material for casting one: EUR 3
Time to mix one batch and de-gas takes about 40 min. (I bought a vacuumpump for EUR 500 and built a vacuum camber for this purpose)
Filling the mould: 15 - 25 min
After 48 hours the part is released (about 25 % of the castings is rejected at this stage) and heat treated over 24 hours
The instills are filed away by hand and the part is pollished
The part is then painted with a PMMA coating.
The holes drilled to the right dimention.
Packed and posted.
I can promise that I will not get rich by making these. I produce them for fun with and for the love of the R3 and to learn how to do more stuff to the bike.