Req8 15^50 Longswords sell for 100k+5e and req8 15^50 Flamberges hardly go over 80k and this is a less popular skin imo... Hence my PC.
I agree req8s are rising in popularity and consequently price, you might wanna hold on to this if you're not in a hurry to sell and it'll probly go up in value.
I'd say 70-80k+ as well, as for req 9's going for 30-40k, a req 9 longsword goes for like 30k now or less, and sure there are inscription ones, but even before r9 longswords had plummeted..