I worry that the lack of attendance at UNT games is a problem that may never be solved. It has been an issue as long as I can remember. There is certainly more that the administration could do to promote the program. However, I wonder if the lack of effort might have some relation to the continued failure of previous attempts to promote the team. I can't imagine the administration would want to spend much money to promote a product if they don't believe in it, and don't have confidence that the promotions would have much impact.
Perhaps the greater issue with UNT attendance springs from the flooded football market of the metroplex. Denton and the surrounding areas have high quality high school football, and the Dallas Cowboys dominate the market. SMU and TCU (until recently) have struggled with the same attendance problems, and both programs have a successful history. Many of the football programs that have outstanding attendance, also benefit from not sharing a market with a professional team (or pre-date the dominance of the NFL).
It seems like UNT will struggle with attendance until we have a team that wins consistently. Hopefully, we are well on our way after this season.