That's a big problem at the moment at my server. I woke up every "season start - sunday", but the last 3 seasons were nothing to buy. I've to little kids, so also sleep less at the moment, so I'm usually can check every day a few minutes after server reset the list - nothing. Around two hours later, I wake up - nothing...
well, I must agree to that.
Youngsters can be a solution in that case (or in higher levels).