If I'm the Crosby owner in your league, I'd have a hard time getting past the fact that you're unwilling to trade away your best player (Malkin) when you're asking me to give up the best player in the world. Simple as that.
Generally speaking, whatever you are thinking of offering is probably still not enough for Crosby.
15 GM Keeper League w/Roto Scoring (G, A, +/-, PIM, PPP, GWG | W, GAA, SV%, SHO)
Start 4 C, 4 LW, 4 RW, 6 D, 2 G (23-man rosters) | Protect 10 players w/a max of 1 goalie
C - Crosby*, Malkin* (C/R), Tavares*, Roy, Mueller
L - Marleau* (C/L), Duchene* (C/L), Doan (L/R), McLeod
R - Giroux* (C/R), Kane* (C/R), Grabner, Kassian, Boll
D - Yandle*, Letang*, McDonagh, Hamilton, Oduya, Clitsome
G - Lundqvist*, Halak, Fasth