The question is not whether other Championship (or even League One) clubs would have better stadiums than ours. The question is whether, if we were in the Championship, we could sell enough seats and corporate boxes in the new stand to cover the payments for it.
This very knowledgeable looking source confirms what we all know:
Palace do not get close to selling out even the existing capacity if in the Championship, and often the average attendance, even when we have a good team fighting for promotion, is thousands short of capacity.
Crystal Palace Supporters' Website
www.holmesdale.net
Hence the white elephant risk.