If you are shooting F-Class or in that style, prone, 1,000 yards then and you are shooting "normal" cartridges, I would agree, you don't have a reason...
If you are shooting longer range than F-Class using much larger than "normal" cartridges, say 378 Weatherby improved, CheyTac improved and even larger 375 HE, 375 Mercenary, 375 Lethal or the uber 416 or 460 HSM, 416 Barret, 50 DTC, 50 Improved then...
Yeah, it might be the way to go.
Of course all that is in the ad for the stock.