Here’s what consumers have asked with answers from Publishers Clearing House (PCH) staff and previous consumers.
They don't. PCH wants you to keep coming back to buy magazines or "as seen on TV" type products. Their web pages have ads for their advertising clients so it's good for PCH if people spend more time there. PCH wants you to think visiting more often increases your chances. Somewhere in the disclaimers it states that you can only enter each prize drawing once per day, but you'll get multiple emails per day urgently telling you to enter.
If you look very closely at the game board, there is usually a "Reveal All" Button near the top numbers on the upper right hand side of the card. If you touch the Reveal All button, you don't have to "scratch off" the numbers on your screen. It's very small, so you have to look carefully for it, but it reveals all the numbers for you. I found this button after scratching off a few games. I hope this helps.
The games cost no money, but they take one irreplaceable commodity... your time. This is important because there is really no skill involved in playing these games, the prize awards are randomly dispersed to a very few. I "won" a hundred bucks a few years ago from the "games" and skill played no part in it. PCH just wants you to spend time at their sites viewing the ads and products of their partners. If you are disabled and immobile, have at it maybe you'll get lucky, but don't let some jack pot fantasy take over your life.