i would say the fabric is probably better quality than saga's 3L, sympatex is on par with gore-tex, if not better.
also as the production for the suits is gonna be small scale, it will cost more to produce, therefore be more expensive.
again, as for saga, some people went out on a limb and bought outwear from a totally new company in its first year, and that's how it was able to improve and grow. 500 is not a ton to drop on a suit, the only suits that you can get cheaper are from saga, fd, and LDC. most suits from bigger companies such as orage and north face will cost easily over 600