What would you use it for?
How often would you use it?
Beyond the optics, what other accessories would you end up needing for it? Bag? Doodads to add, like a B.A.D. lever, gadgets to mount on the rail? Magazines? Gizmos somewhere else?
How much would all the addons cost you?
Will you have enough fun with all of that, between the tinkering, the shooting, the reloading and whatnot to justify the cost? These aren't really things we can answer for you.