A lot boils down to economy of scale - there simply isn't the demand here, coupled with our 20% tax on goods, compared to many US states of 9 or 11%. Less competition invariably means higher prices.
I agree with the difficulty for LQS owners and support mine as much as I can afford by attending drop-ins and classes regularly and hiring their Gammill. I also ask family to buy me vouchers for it when present shopping. However I usually only buy fabric when it's reduced or on sale.
With regards Customs - I've only been charged a couple of times and even then it still worked out cheaper after I paid import duty, tax and handling fee!