Um... so how's this work, could I for instance make a Fire Sword using the "special" fire crystal and then name the sword whatever I wanted? Cause in a way that's kinda neat. Ooh, another question. If I made said item and named its "My sword" or whatever, would anyone who checked my equipment see it as "my sword" or as "fire sword"?
signed items are usually given away as gifts. If you waste your money on a signing crystal just to sell the item your not really thinking smart.
For example wedding rings are usually signed by your bride/groom
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Mental notes Never trust a first time NM hunter (almost sent me against a lvl 62 mob O.o) 2. Dont use low lvl equipment on a BCNM O.o 3. Never play leapfrog with a unicorn (OMFGOUCHMOTHER@#%^ERGIVYASSSKINBACK)
However, if you sell your "signed" item through AH as soon as it sells the signature is lost. So this means you have to trade or bazaar the item to retain the signature.
These items are probably best used when you are making something for someone or yourself.