Silicone is an extremely difficult elastomer to work with and requires some specialized industrial equipment, technical and practical experience, and vacuum processing to get a successful result. Something I could not recommend just anyone attempt.
Silicone runs in the range of $100 per gallon and mistakes quickly become costly. The combination of the initial investment in research and equipment combined with the high cost of the raw material is probably why there just aren’t that many studios creating toys in silicone. The reason why I think I am the only producer of large silicone toys on the market today is my very personal interest in the product.