Sure. A bit about what AssumeTheCrown said,
you'll spend alot of time in front of the computer. So instead I pay other guys to do the hard work while I just shop for lines, get bonuses etc and place the bets.

I do AFL/NRL and S12 myself though (which takes up 7+ months of the year. They only take up around half an hour each week though, more in the beginning of the season thanks to outrights. My other betting takes up maybe 10-15mins 3-4 times a day. I'll spend around an hour going through a few different forums.

It doesn't have to take up alot of time, it just depends how much of it you do yourself, and whether you can trust/afford anyone else to do some of the work for you.