fretokleptomania
An obsessive compulsion to steal guitars regardless of one's economic circumstances or, indeed, one's ability to play the instruments in question.
" Who was that girl who just walked out with Ellie's blue guitar?" "I dunno, but my strat has gone too." "OMG! You don't think she's a fretokleptomaniac do you?!? Shit! Check the goddamn basement!!!"