"Bulk" is somewhat of a misnomer these days ... or, at least, an inversion. Since most consumers use the "bulk" area in order to be able to buy small quantities, they're happy that instead of buying a pound for $5 they can buy a half pound for $3. The bulk savings goes to the retailer, I suppose. You can tell that, at least at whole foods, customers aren't really intended to buy in bulk by the size of the bulk bins and the available packaging. If you wanted to buy, say, 5 pounds of couscous you'd empty half the bin and have to use 5 flimsy plastic bags.
Your better bet off heading to Middle Eastern Market or Al Khayyam for couscous, bulgur (remarkably versatile - since I've started using it, It's become one of my favorite quick meals ... throw in some diced almonds/pistachios, some currants, raisins), basmati rice, chickpeas, etc. Probably fresher due to the turnover and definitely cheaper. You also get your choice of size of bulgur; different uses require the bulgur to be fine or coarse. If memory serves, bulgur and couscous come prepackaged in 2 lb bags for $1.98 and $2.98 respectively. Stock up ... it's not like it's going to go bad.
That said, I think the process of making couscous at an industrial level is not as efficient as that of spaghetti making. And the demand is obviously lower, so economies of scale aren't running at full tilt. Near East seems to have cornered the market and there's not enough demand to stimulate more competition and drive down prices. Some price premium is probably justified ... just not $6 a pound.
rien