Having your birthday perpetually on a wednesday would also not be so much fun. Perhaps "year day" could shift every year forward by 1 week day - year day could be Monday and then Jan 1 of the next year could be a Tuesday etc.
Right now if you get paid every other week, you get paid 3 times in 2 months and twice in all the other months.
If you get paid twice a month on the 15th and last day of the month, payroll constantly has to take account of holidays and weekends because the day of the week is always fluctuating.
All of those things would have to change, but they would be simpler after the change. It's the same argument as switching to the metric system in the US. Unfortunately the fixed cost of having to switch outweighs the benefits of switching (certainly for the calendar, less so for metric).
I think all but 5 states have laws dictating pay frequency, and in most cases they require at least two times a month pay frequency.
The most popular pay schedules tend to be 24, 26, and 52 times per year.
EDIT: This was supposed to be a reply to redblacktree. State law examples: - http://www.dir.ca.gov/dlse/faq_paydays.htm - http://labor.ny.gov/legal/counsel/pdf/frequency-of-pay-frequ...
Where did you get this? I have a friend who's paid monthly at his salaried software engineering gig.