Three issues,
Most people looking for a dry ski slope know where they are and what they are called. Ie Hillend in is my local one in edinburgh.
Secondly snow domes are more popular now.
Third issue is like TW said there are not many of them around so very little competion between them.
To me I'm a keen keen skier and would not reg this. I think you will have a hard time selling to an end user. Unless you can sell to the companies that make the matting ie dendex, neverplast and snowflex