Depending on what you do and who you are, vacation can be way more hassle than it's worth. Here are some cogent reasons to stay at the office:

1. If it's crunch time, everyone will resent you.

When your team is working hot and heavy on an important project, and customers and investors are breathing down your collective necks, leaving the team to sink or swim is a bad move. More important, if you've got any enemies, they'll use your absence to their advantage. You might return all tanned to discover you no longer have a job.

2. You'll be expected to work anyway.

The downside to connectivity is that you're always available, which means that if you're important at work, you'll be pestered to make decisions, read reports, handle emergencies and so forth. If you pretend you can't be reached, you could end up coming home to huge mess that requires extra-long hours to fix. So much for relaxation.

3. If it's the slow season, you can "vacation" at work.

Why pay money to relax somewhere else, when you can relax at work? When I worked a corporate job, most of my coworkers took the days between Christmas and New Years as vacation days. The offices were almost empty and those remained came in late and left early, with 2 hour, 3 martini lunches. Sweet!

4. Accrued vacation time can help fund your startup.

If you get paid vacation days and get to keep them if you don't use them, it's like having an "exit bonus" when you decide to start your own company. When I voluntarily  took the layoff package from my corporate job, I had 10 weeks of vacation banked, which with my severance gave me nearly half a year at full pay. Even sweeter!

5. Vacation can be exhausting.

If you've got kids, herding them into planes, trains and automobiles, and then dealing with their hyped-up energy in a hotel room can be exhausting. And it's not just kids. I've got a friend whose wife fills every second of their vacations with activities. He returns from vacation looking burnt out rather than relaxed.

6. You've got annoying relatives.

If you remember the original Vacation movies, the funniest (and scariest) part was when the Griswold's dropped in on their obnoxious relatives. Some families lay huge guilt trips on family members who don't spend their vacation "visiting." So think: would you rather get stuff done at work or watch Uncle Melvin pop his dentures?

7. You've already worked down-time into your schedule.

If you've created work-life balance, you're already getting rested and recharged on a regular basis. You're regularly exercising, getting plenty of rest, and eating healthy, so going on vacation might easily throw your routine out of whack. That's especially true if your healthy behaviors haven't yet become habitual.

8. It's money out of your pocket.

If you've got billable hours or work freelance and are in high demand, every day away from work is money you're not making. In these situations, vacation has a huge lost opportunity cost. The way things change nowadays, you'd best strike (at it were) while the iron is hot. You can relax when you retire on easy street.

9. Admit it, you'd rather be at work anyway.

If you've landed your dream job, work is like getting paid to pursue your favorite hobbies. I don't know about you, but when I'm not doing something productive, I get sort of twitchy. I've been writing since I was four years old and starting businesses since I was six; it feels weird and unnatural and (frankly) a bit draining to "relax."

10. Montezuma's revenge.

'Nuff said.