An obscure football manager in Scotland once said this in a televised interview "statistics are like mini-skirts - they look good but hide the most important part"
Not saying it's the best quote ever but stuck with me for the sheer randomness factor.
I think it applies here, PSN could have more revenue than Nintendo, but how that actually translates to profit is unknown and is really the only thing that matters. Revenue for show, profit for dough!
Actually, how revenue translates to profit is very straightforward, there are very simple formulae depending on the accounting standards the company complies to.
Also, it's not statistics that hide important information. It's just that there are many people that are unable to understand and interpret the numbers.