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I don't see a problem. Keep them all or sell a few.
My guess is you know which you would keep if you were really pushed. If you like them all equally, it shouldn't matter which you sell and which you keep. Consider rolling dice.
As you may know, I have a fairly big amp collection. Every time I rotate a different amp into the playing position, my perception is it sounds awesome. However, I eventually begin to tire of the sound and long for something different. I put another amp in the playing position, and it sounds awesome. Rinse and repeat.
Here's the deal: Some of my amps are naturally closer to my intrinsic tone goals than others. Ashdown CTM300 is awesome, but I probably wouldn't choose to use it on a gig unless I was getting paid big money to deliver the unique tone it is capable of. While I can enjoy the CTM300, I am really more of a solid state guy as I like high-fidelity and massive headroom.
If I could only keep one amp, it would probably be my Genz Benz GBE1200. I don't gig anymore, so the weight wouldn't bother me. If I planned to start gigging, perhaps I would choose the Genz Benz ShuttleMax 12.2, which covers a very similar range of tones, but is way lighter. If it had to choose a tube amp, it would probably be the Mesa 400. The 400+ has considerably more headroom and kicks like a mule, but to me the 400's sounds a bit sweeter and more musical.
I don't have any reason to sell any of my amps, so I keep and enjoy all of them. I may add a few more to the collection if the right opportunities present. Maybe I will eventually get around to selling some of them when I am too frail to lift them into the playing position. Or maybe I won't. I am not going to worry about.