While I approve of finding a way to get your foot in the door for lunch sales, the soon abusing of it really turned me off. Too much like politics really. Other clubs or the school itself could have used that money.
The only way that the chess club was going to take away sales from the other clubs is if their percentage of sales increases, and even then it would have to increase beyond a threshold where it started eating up the extra days beyond the original sales the other clubs where having.
Sure it could be the case that other clubs where missing out, but it is very much more probable that everyone was benefiting from the chess club 'hack'.
Besides, you could argue that if your club does nothing to take at least some advantage of the relaxed rules it's the other clubs' fault, not the chess club's. In the end the clubs profited, the members profited, and the businesses that provided the food profited. This is a good compromise if X club didn't get much benefits after all.
And it involved the student government.. so of COURSE it's political...
If everyone was acting all nice and fair and happy, all it takes is one person who really gets how to manipulate public opinion to their own ends and they'll rise to the top... so unfortunately, it's reality.