lol, its all just a style man, its like a name, if its fuckin purple it must be bomb!
people do the same thing with names, take some regular old nugs and call it "orange budd" or something like that, just to sell it for more, its all marketing.
and to the others that like it, purple budds produce the most resin, less thc per amount of resin, but double to tripple the amount of resin.
and are you talking about budd thats purble or budd like grand daddy purp? cuz "purple" strains are not alwayse purple, you have to lower the overall temp durasticaly toward the end of growth to make it turn more purple. so its really more like why do people want weed that was grown in a colder area over the same grown in regular temps? makes no sence,besides the fact that it makes it push more resin from the stems and branches to the budds. but either does the color or name. thats why i go by smell.