Yik Yak is a cesspool and all the worst parts of social media rolled into one. I wouldn't say that app is a true representation of the student body. If you said most students were apathetic to what SGA and UB does, than yeah I would agree. I wouldn't put all the fault into SGA and UB though as explained below.
The administration, at least during the times of Jindal's education cuts, really tied UB's hands and prevented UB from using more money for concerts. Student fees for UB and SGA are considered public money and are scrutinized by state audits (so they say). So if UB or SGA is deemed to be wasting money (like spending 80,000 for only 1000 people to show up, a ratio of 80 dollars spent for each person), the administration says that the state could cut the funding. In order to protect UB and SGA, they would put limitations on the amount spent for a concert, which severely hurts the chance of bringing in a better artist. I wouldn't doubt that they'd try and influence UB's selection in order to get better attendance and prove the money is well spent without giving UB a choice.
Furthermore, the administration would not allow a fee increase for these organizations. So UB and SGA are inhibited by the administration by how much they can spend and then not allowed whatsoever to increase fees and have more money to bring in better artists or whatever SGA does. The budgets have stayed the same for 20+ years now (probably much longer). So while prices go up for everything, the choice of artists for concerts will only get worse as the budgets continue to stay the same.
SGA has representation on the following councils:
Student Advisory Council
Food Service Committee
Administrative Council
Student Organizations Committee
Athletic Council
Technology Fee Committee
Parking and Traffic Committee
Student Activities Committee
Instructional Policies Committee
Honor CouncilGraduate Council
University Fee Committee
Library Advisory Committee
Student Organizations Grant Committee
Behavioral Standards Committee
So the SGA president or whoever represents SGA can influence these councils if they have the willpower. The only committee the SGA president is explicitly mentioned to be a part of is the Student Organizations Committee which handles disciplinary decisions for students and organizations. That includes the UB president and presidents of the inter-greek organizations as well for student representation.