i've been thinking the same thing. i've got my RG570RM that i used to play the hell out of. now, i only really play my RG7620 Of Doom and the XV500. the RG570RM NEVER gets played anymore, but it was the first guitar i ever bought myself. but then, i never play the fucking thing
i think i need to sell it. the thing is, if i want to replace it, RG570's aren't hard to come by. if you sell the 540S7 (to me), then it will be harder to replace, as mentioned already.