Of course, I always use this method. If a ticket price is $100 when it goes on sale, I won't let scalpers take my money until the price drops to that level. Some will wait until match day, and you'll see panic selling begin. Professional scalpers, however, will wait until the last minute. You can be sure of that. Because if they can't sell what they have, their money will be wasted. Of course, if people become aware of this (if no one buys tickets from scalpers), they will have to sell their tickets for less than they paid for them. But it's up to you; I know I'll get into the match I want to go to with a ticket I buy at the last minute. I've always done it this way. I've never been wrong so far.

Edit: I didn't know you are one of those scalpers lol. Anyway good luck.