I've been getting MUCH more selective about what comes in, and clearing out a bunch of mid-fi stuff - mostly acqurired during the first few months I was into vintage gear. More and more, I'm resisting the "tyrrany of the temptation" and the "kid in a candy shop" syndrome, to emphasize quality over quantity.
I'm increasingly narrowing down what items I'll bring home. Units don't have to be TOTL, but nearly so (upper couple of models in a series), or at least higher/better models than what I already have. For example, I happily grabbed an SX-1050, since I don't yet have an SX-1250 or SX-1980, but I don't bother with three-digit SX series models, now that I have the 1050. I happily picked up a Sony STR-V6, although there is a V7 model beyond it. I would pass up on an STR-V5, since I already have the V6. I would pick up a Sansui G-8000 or above, but regularly pass up on lower models like the G-3500.
If I bring home speakers or a turntable, at least one pair has to go out in exchange; I won't add to the number of those that I have, and want to gradually reduce the number. I sold two turntables a few days ago, but haven't bought any new ones, so I'm making progress in that direction. I bought three pairs of speakers in the past few weeks, but have taken three sets (one a 5.1 system) for sale, so that is also progress. I'll only bring home speakers that I KNOW (from reading here, at least

) are really good-sounding; I don't buy unknown speakers out of simple curiousity to hear them, any more.
I've also grown pickier about what condition I'll accept. Gear can be dusty and dirty, wooden cases can have minor scratches that will sand out, but nothing can be damaged in ways that I can't restore to near-mint cosmetic condition. For example, a few tiny scratches around the volume knob would be acceptable on the faceplate of an amp, but a big gouge or broken-off corner would not be. [Exceptions would be made for really-rare units like a Marantz 500 amp, if I could find one!

]
Since I buy at wholesale, I often cannot test gear before buying it. I always assume some functional repair work will be needed. After all, even when the unit still works (which they often do), controls should be cleaned, aged caps should be replaced and things adjusted/aligned, anyway.
What has changed for me, significantly, is ... I do buy boomboxes, which I never used to. I've started buying the bigger and rarer models because I can do so in a market where they are available and not highly valued, when most collectors who want them in other locations cannot find them. Due to this difference in supply and demand, I can make money from those, so I buy some for resale. I'm keeping a very small, select collection of a few of the rarest "holy grail" ones for myself, like a beautiful TOTL Marantz PMS-7000, but the rest I only buy for eventual resale. If the prices on the "keepers" goes up enough, I might sell them all. Flipping some of these helps to fund other vintage purchases.