Controlled it by having enough hars to fulfil current need, and to focus spending on overarching GAS - two trumpets, one cornet, one gold plated cornet mouthpiece - mute, another mute, more mutes. CDs for listening etc.
I think I have about 19-20 diatonics and one chromatic. All major scales, some doubled/tripled up on different styles, and a few low tuned, plus a Hohner Steve Baker Special edition in D.
I need all the minor keys, so that's at least 12.