The reason for this is two fold. First, the appliance manufacturers have never made these sets available because they want to sell the whole rear tank for $300 to $600 and secondly, we were one of the first to offer a full range of bearing and seal kits.
We spent over two years buying front load washers and stripping them down and sourcing high quality bearings and seals for them. For 4 years prior to this we did well over 500 bearing and seal replacements on front load washers.
Also, the bearings and seals we use are a MUCH better quality than the cheap ones GE, Whirlpool Corp and other OEM's put in them.
We have been to many customers homes over the years and had to tell them it's going to cost them as much as $800 to repair their machine. Not fun we can assure you. Now, with the kits we offer, an appliance tech or home owner can replace the bearings and seal for a reasonable price.