Uh....pretty sure PSN cards weren't sold till late 2008. How was it on par with the Wii? Also that graph is pretty useless without defining the Y-axis.
It's not that surprising though, xbox cards seem to go on sale regularly, probably because they aren't defined as a dollar amount. On PSN (assuming you have a credit card) you might as well just do it directly since you can pay the exact amount (if over $5). Still don't understand why the Wii was so low considering it probably has the lowest percentage of credit card holders.







