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By being _very_ selective about what I collect in that scale.
Over roughly 10-12 years, this is what I have (note, some cheap stuff early on when 1:6 was not looney toon):
Asuka Langley (Neon Genesis, Medicom)
Colonel Jack O'Neill (Stargate SG1, Diamond)
Princess Leia (A New Hope, Sideshow)
Destro (GI Joe 25th, Hasbro)
Cobra Commander (GI Joe 25th, Hasbro)
Indiana Jones (Raiders, Sideshow)
Indiana Jones (Last Crusade, Medicom)
Batgirl (13" classic series, DC Direct)
Dr McCoy (Star Trek 2009, Playmates)
random Nazi/Soviet soldier (Crystal Skull, Hasbro)
Cammy (Street Fighter, Medicom)
Yukari (Girls und Panzer, Medicom)
Black Widow (Age of Ultron, Hot Toys)
And somewhere I've got a case of RAH Harley Quinns kicking around because I thought I could sell premium toys to other collectors (LOL, was I a fool or what).
So, yeah, if you're on regular budget (not rich or a NEET and still do other stuff), you just have to keep it under control and not lust after everything that comes along. As a bonus, you're far less likely to become one of those clowns who has to "purge" their collection and whine about it online.