yes !

But, the server is not a vps.
The server is I7 4790K ( I7-SSD-1-32 by SoYouStart.eu ) with SSD and 32G ram and good connectivity.

If I have 100-250 users, i can perhaps decrease the %

Initially, it's a personal project because aikapool is not easy for the connexion and mining-dutch have not a good rentability.
Obtain a block is a bit of luck and I am very happy if i can arrive to discover a block before mining-dutch or aikapool when the rentability is > 10000 dime !