i believe it's mostly for stash-builders, who seldom want more than 1 yd at a time. and they try to spread it out. it also discourages dealers (like on ebay) to buy up everything immediately and mark up the prices.
but in the case of there being only, say, 3 yds left and you want all of it, i believe he price is the lower one.
i would check with their customer service 800 phone number if you want more then 1 yd or an explanation.
i've spent a lot there, but only in 1 yd pieces. my best advice is that if you're really interested, find out soon, because at this price, they won't last very long. at least the attractive ones.