I have about 15 cassette decks. :scratch2: Don't quote me on that as they multiply when I am not looking. ... Whether I collect or hoard them I am not sure. I just like getting a bargain on decks that were hundreds of dollars new and can be had for a handful of dollars today. ...
Oh, boy, does that sound familiar. I wouldn't say I'm completely cured, but my cassette-deck "addiction" has been in remission now for several months. Prior to that, however, they multiplied enough that I've lost track of how many I have. Somewhere between 15 and 25 is probably accurate. That in itself tells me "there is a problem," even if it is only that too many decks are sitting there not being used.
I really only want to keep a couple of the very best ones. I'll hang onto the Nakamichi Zx-7, as it is truly wonderful-sounding, and the Akai Reference Master GX-95, because it competes sonically with the Nak and looks even better, but I have a hard time deciding which of the other good ones, including a few Tascams and TOTL TEACs and others, should stay. They are all very good, but I don't listen to cassettes all that much, so I don't NEED them.
I will keep a couple other specific ones (Marantz, Sansui, Pioneer) to complete specific stacks of those brands.
One or two are so unusual and nice I want to keep them (the Esotec-branded SD-4000, for example: in a couple years of regular looking, I have not been able to find another, or anyone who has seen one, not even in Japan. For all I know, it might be unique in the world. It is in good shape, and wearing wood. How can I sell that?

).
I will probably be getting rid of a number of horizontal (top-loading) types, but I want to find a suitable channel to get rid of them through, first. They include some of the best build quality I've ever seen in audio gear, and they still sound pretty good, so I just won't see them go into the trash!

However, they are not as easy to find space for (since you need access to their tops and so can't stack them), so most of them must go. Two days ago I passed up a Nak 500 (duotracer), and even the one I already have will probably be sold. [The 700 Tri-tracer I have was one of those nostalgic "drooled over it way back when, but couldn't afford it" purchases, but that will probably go, too. The ZX-7 sounds better, is smaller, and makes a good enough "Nak representative".]
I do want to get the big Marantz horizontal one, though, but the only one I've found so far was priced at over US$300

screwy

, so up to now I don't have one.
There is one other possibility I've thought about: to put all the horizontal decks into a single rack, each one on a slide-out drawer, to save space and still gain access. I could put a selector unit in, to make it easy to route signals in/out of any deck, and thus easily keep them all in rotation, but what's the point, when actually two decks would fulfill my whole "need" for cassette capability, and I'd end up having to waste too much time on azimuth adjustments/matching?
Eventually, I'll get things down to probably four, maximum six "keeper" decks and no more... and maybe one day only two decks, but it's a gradual process for me.