I dunno. I actually don't think it's all that expensive of a sport if you can invest in your equipment and keep it long term. Sure, you'll spend a few grand one season for a setup that will last you three or four seasons. The season pass will set you back another $600 per year roughly.
I've had my current setup for five seasons. Same board. Same boots. Same jacket, helmet, pants, etc. If I do a back of the envelope calculation, my sport probably costs me $1,000 per year on average.
There really is such a thing as competence, work ethic, and patience. These traits tend to lead to success in other areas of life, including the accumulation of wealth and advancement in one's career. Not everything can, or should, be explained by privilege. Great people really do earn their greatness.