I think that still remains the case, the fact is the lower grades of willow may be heavier so will make a smaller bat in terms of edge size for the required weight or a heavy bat in terms of average edge/spine height.
Any decent batmaker will still ensure even the lower grade clefts are pressed to optimal performance levels. Having take the opportunity to make the 7 hours round trip to B3 to check out their set-up prior to stocking them im confident that they have a set-up thats probably only second the GM in terms of the equipment, size and processes they run. The B3 bats I have in stock are very well made and feel very solid in terms of the product itself with chunky shoulders, toe and middles and a very thick handle, they are aiming at the higher end of the market but no different to the M&H, WCW or even some Indian brands now that are looking at £300 for a G3, £400-£450 for a G2 and £600-700 for a G1.
As previously mentioned B3 get their willow from JS Wrights so will have to factor in the prices of clefts, handles, stickers, etc before they get don to the nitty gritty of what it costs them to actually make it into a bat, have staff present to deal with customers and process orders.
The vast majority of bat makers are one man bands so don't have people on the payroll that add to costs each month, they can therefore lower their costs on the products due to this.