Usually, when you plan to move, you sell what you don't want to hassle with packing in a garage sale. Sometime after settling in (and of course finding out that the sofa doesn't match the existing chandelier, your area rugs don't fit new areas and your garage is smaller than you thought) another garage sale happens. If a child is moving off to college and they'd like to get rid of some things that they can't take with them, there's a garage sale. You discover you can fit two cars in the garage if you organize better (and get rid of 3 extra rakes as well as lawn mower and weed-whacker since you've gone to desert landscape.) Heck, there are tons of reasons to have a garage sale. Sometimes you don't get rid of everything the first weekend.
But, it seems that someone in the Las Vegas legislature has put forward an idea to limit people to 2 a year and anyone holding a yard/garage sale would have to register it. I can see only two good reasons to do that: your neighbor has one each weekend causing traffic problems or it would somehow force you to take down your sale signs when it's done so people aren't looking for your house the next weekend. For all the good it could do, who would run this? How many state/local employees would our taxes have to pay to sit near a phone or fax machine collecting your information? How many do you pay to check records to see if they've gone over the magic #2? How much staff do you hire to look for people not reporting their garage sales? Seems like a whole new section of government would have to be set up for this. Would you have to pay a registration fee for your yard sale to fund a department like this? Would fines for going over pay for these salaries?
Seems to me that there are better ways to solve this. I even have a few impromptu solutions of my own. If a house is having a sale each week, they should be asked for a business license for their home address (zoning restrictions would prohibit a store set up in a residential area so that would keep that from happening.) If people are leaving up signs way too long, any police car with downtime can pick it up and drop a nice little ticket for littering at their doorstep. Anything would be better than finding a way to get into my pocket.