I bought my shit box, didn't bother to do a comp test because I was too lazy and it was cold lol (had the gauge and socket set on me too) and still haven't done one 3 years later.Also not to mention I screw in more boost than 90% of owners and thrash the shit out of it on the track.
Once it does grenade, I'll just throw in a 2nd hand motor and do the same thing.
Moral of the story, thrash it till it blows up. Leak down test or compression tests are pointless once you've already bought the car IMHO.