Maybe you do, maybe you don't. But if you're practicing for a tournament, you're going to want to have access to everything you'll have access to in the tournament game. That means you're using your best items in practice, and you're losing more supply than you're gaining in practice. Furthermore, in CoHO you received less supply when you played custom games than when you automatched, which means a tournament player is actively punished for playing proper practice matches.
No matter how you slice it, it's a terrible situation for anybody who wants to play the game competitively, and this isn't even accounting for the fact that ladder players who pay money would have more consistent access to the best items than ladder players who don't pay.
now, now Hold on!....
I know, you know, that you were part of a select band of 8 who agreed to play in the Harlequin CoHO tournament, before CoHO collapsed. Remember? With Nystrom, Audemed, ProPipe, Johny Crypton from the Czech Republic, AFKNinja (from NZ), Alphonse Rebain (SP?) from Estonia, Robert Taylor?
All power to your elbow It was an enjoyable spectable