When people aren't arsed they use the 'Richard' measuring contest. I know i'm not professional the club made their decisions. I think 2 simple things.
One, the bigger capacity the more of a likelihood a lot of ticket prices can be kept down. A smaller capacity means if we want any where near matchday income as our rivals (the big six, not Newcastle, Leicester or Aston Villa) then prices will rise sharpish.
Two, 52,888 might be an increase of around 13000 on Goodison but is that really going to be enough? Goodison isn't 39,414 because we only get that many attending. It's a stadium that has fallen behind in a number of ways to other clubs. If we had 55,000 now we'd fill it. Throw in the waterfront location and day trippers I think there's potenitial for more people wanting to attend.
As for the size as Meis said "size envy". Why not? Why do we, on of the big clubs in the league, have to remain cowering to the likes of City and Liverpool even with a new stadium? The club is moving forward in spite of a lack of confidence in themselves and the fan base. The new stadium should be like one of those in the Euro's. It should be big, bold, triple tiers, 60,000 plus. That's what does my head in it's like we've settled for the scaled back version.