Most technologies you will realise that they were geared towards downloads not uploads. It has been the trend until the explosion of voip and soho.
By design, downloads speed is directly proportional to uploads ie, if you increase uploads speed, download speed decrease. There is now equipment available which can do uploads and downloads at same speed.. bt it comes at very high cost.
One other thing to note is the way our providers have been trying to reduce cost of mast aerial implementation and power consumption. They have been spacing boosters as further apart as possible to cover wide areas and long distances.
This reduces the number of mast needed per area hence cheap. Bt with wireless tech, the further the signal hav to travel, the less speed when downloading one can get.
Now if the isp wants to provide fast speed, the boosters have to be closer to each other and more power have to be pumped into them.
So you can guess which option our isp took!!