naw.. they cost the same in my area... they are just better because of there color... u get more bang for your buck like... if tho fish cost the same and are the same size and species.. would u buy a duller one or the brighter better looking one??? .. that is pretty much what it comes down too...
ohh and on if tusk are reef safe?? well some are and some ar'nt... they dont really eat the coral to say... but they do eat all the clean up crew.. thats the only reason why they ar'nt reef safe.. but if u have a big enough tank then it would be ok...another thing that i have read but not personally tried is that sapossingly.. if the tanks inverts where introduced into the tank and established a 'safe zone/home' prior to introducing a tusk.. the tusk should'nt bother the inverts and suck too much...
i have a tusk,lunnar, clown trigger,nigar tirgger,and a juvi emp..... i kinda tested it out with snails and it seems to be ok..afther the snails made a 'safe place' but they only come out at night now.. i havnt tried hermit crabs or crabs yet but i will 1 day..