We don't even know what $5000 equates to in the game. The initial economy of "$", "$$", "$$$" etc. for various small purchases has no relation to it, and the money earned and spent in the mansion mini game is not in line with US expenses ($65 to replace all the windows in the mansion for example, or $1 to clean someone's windows).
Just to arbitrarily scale them, maybe we're talking real life $50 to clean someone's windows (3 hours work perhaps), therefore the replacement of all the mansion's windows would scale to $3200 (that's probably still too low but good enough for argument's sake). If the mc's $5,000 is of the same economy, then it's equivalent to roughly $250,000, which would make sense as a trust fund amount from a very wealthy relative (5K, in real life dollars, was a kick in the balls really).
But then when the MC get's the check, the dad says 5K is not much. That sounds like it's 5K by our standards, not by the mansion minigame standards. So basically, it's not enough money for anything...
The MC will probably just blow it on sex...