2freeq, maybe, maybe not, if someone buys it then yes but this value will be determined by the specific buyers and how bad they want it. To properly restore your RM125B for example you could without doubt spend in the vicinity of $8000, add the labour costs which are never recovered and yes, that figure does have some foundation. Same bike may get passed in tomorrow (unlikely)for $1500 such is the nature of the vintage bike market.
