becoming a sort of a reseller isnt more cheaper?

if a person get 1 or 2 more friend´s share the expenses isnt a better deal than buy it from any reseller?

If he presents himself as a reseller and only buys 1 server to share with his friends but renews the account for several months will ovh stop selling directly to him if he dont buy more than 1 server ?
http://www.kimsufi.com/
Kimsufi 500G 30€
are there any more cost associated ? to buy a 30€ kimsufi dedi server
you pay exactly that?

Got nothing to do with reselling; you can, as a person, get a machine from OVH, install the proper software you need and share it with 1, 2 or maybe 900 friends if you want.

And yes, as long as OVH gets paid, you can split the cost among your friends ofcourse.

so the same apply to kimsufi servers (Kimsufi 500G 30€)
is this the final price you pay ? it seem way to cheap considering the prices the resellers ask for the slice of the servers
are there any users here who bought a server from them for personal use ?

I have several regular OVH-machines and they serve me quite well; if you're splitting with 3 persons, I would rather recommend the Kimsufi 750G or the OVH SuperPlan Mini since they are much beefier on the CPU and RAM... This leaves plenty of RAM & CPU for each person; the Celeron you're looking at is, in my opinion, waaaay underpowered.

Of course it's cheaper to buy directly from source, but many people are forced to use resellers because of the country they live in.

Yep, and also, sometimes people buy from resellers to get additional support if theyre not so good with handling their server configs :)