Lawn told the club's official website: "Julian and myself, as well as his father, have really pushed the boat out this season. But that can't be done year on year.
"That's why it's important that the fans do buy these season tickets. I must stress we can only give cheap season tickets if we maintain the numbers that we're getting.
"The year we don't get those numbers, we'll have to reconsider and maybe go back to the old prices. I'd hate to do that, because I think the fan base of Bradford is big enough, but we've got to be looking at getting at least 10,000 season tickets to be able to justify the pricing levels.
"There are fans that we've created with this. Before we came on board, we were getting 6,000-7,000. Now we're getting 11,000 and 12,000. So there's 4,000-5,000 extra fans coming regularly."