Why does a Tor server need VDSL or fiber?

I tried to run a tor server and was astonished that it isn't used after 5 days.
Asking for the reason gives the answer that a minimum of "at least 250 kilobytes/s each way" is required.
https://www.torproject.org/docs/tor-doc-relay.html.en
(I only have small DSL and can suffer below 80 KB/s)

So server with less then 250 KB/s seems to be dropped in the network!
Has this strategy started in April 2014?

Loss of relays in the middle of April 2014
https://metrics.torproject.org/relayflags.html?graph=relayflags&start=2014-02-01&end=2014-08-01&flag=Running&flag=Exit&flag=Fast&flag=Guard&flag=Stable

Why this is not published in the installation guide or in the FAQ?
You don't need to try to run a Tor server if you don't have fiber or at least VDSL!


When i have a close look at the statistics i can't undestand the data, because it does not really fit with this strategy.

https://metrics.torproject.org/bandwidth.html
13000 MiB/s maximum Bandwith (advertised bandwith)
=> For 7000 relays = 1,8 MiB/s = 1901 KB/s

6000 MiB/s real traffic (bandwith history)
=> For 7000 relays = 0,86 MiB/s = 878 KB/s

https://metrics.torproject.org/networksize.html
7000 relays
4200 bridges

https://metrics.torproject.org/userstats-relay-country.html
2000000 users without bridges (only relays)
=> For 7000 relays = 286 user / relay

Then no more relays are wanted?
This seems to be much users per relay!?

=> For 2 Mio. users 6000 MiB/s traffic = 3 KB/s per user

That's a poor bandwith per user.
How does this match together?