Just get 60 and if there needs to be empty seats so be it. Reduce season ticket prices to get bums on seats if need be. I feel like with 50 you build yourself a glass ceiling. That single stand they are building at a capacity of 12-15k isn't like the yellow wall which holds 25k. It's like the kop, which holds 12.5.
Would be silly to build a stadium smaller than anfield