A snake that looks that nice is worth up to $200 in my book.
In all likelihood there is no special breeding potential there for extra-nice offspring as the stripe on snakes like that doesn't seem to be passed on very well.
HOWEVER, I'm definitely of the opinion that a snake's value is more than just its breeding potential. Many in this hobby however, are not of the same opinion when they purchase animals.
IMO, that is a VERY nice pickup, I'd call it in the top 1% of nicest looking normals out there, at least for my tastes. I just love full stripe harlequins.