I agree. You got stickered for bald tyres for a reason. I have had the privilege of driving on both bald and shit tyres, and trust me it isnt a nice expeience. Even without boost, I was afraid to drive my car (I had had my license for only a matter of weeks when I nearly hit a tree because my car slid out, I turned the corner at 10km/h if that). Mate, tyres arent that expensive, just do the right thing and you wont regret it.
Also, listen to what Brendan has to say. He has a lot more experience then most of us, and knows what he is talking about... Most of the time