THERE MAY BE SOME YEARS when — because of work scheduling, family obligations, or a simple lack of time in general — you cannot use your week of timeshare. If this is a rare occurrence for you, it will not be so financially off-putting that you will want to sell your timeshare altogether. Still, though, why just let your unit sit there unused? Sometimes, you can make back a little bit of the money you have already spent by finding a renter to take your week's worth of usage off your hands.