It really depends on how you play and the party you have... if you've got a god wizard even 10 dpr is enough at level 10. But it won't give much satisfaction to the players I suppose.
Still, 75 dpr at level 10 sounds about right, maybe a bit low, but no too much. Ofc I mean 75dpr considering that an attack or two missed.
That of course is true with a complete party with heals and battlefield control.
In my case the party has lots of heals, stealth, mobility and battlefild control, but rarely we see a character doing more than 100 damage in a round, REALLY rarely, but the party is working in an awesome way against higher level encounters even with the """"low"""" dps, by disrupting all enemies we face and slowly killing them