I know I saw this suggestion a month or two ago but can't find the original topic now. They had some good ideas in there. As someone who has a lot of pets and a lot of items in their tcs, I would support slots for a set fee however they could work it.
I agree with this.
And yeah its 75k per slot, i think OP or someone already acknowledged this.
Im not sure about dealing with the wait time, i thought in a previous the staff said they wanted it to have a wait time. idk, my memory isnt that great.
I agree with this 100% right now.
I was rummaging through my vault earlier and I have so many things I wanted to put in pet treasures but just haven't had the time to get 1 (or maybe 2 if I'm luck) MKB a day and HOPE I get enough slots to cover the ton of times for this pet or some other pet. With my luck, I have better chance at getting a random event for 3 treasure slots than EVER getting one from a MKB, so I would gladly pay 75K or so per slot, as long as there isn't any time limit on them anyway.
As for the MKB, I'm behind a way to redeem/trade it in for two slots or so or enough SP to cover the slots and after a month just remove that option. It would give everyone enough time to get rid of their possible hoards.

I would LOVE a drop down like the resort to select how many slots you want on a pet tc. I would absolutely spend millions in order to get this. Even if the price was 100k per slot I would do it.
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I would kill for this option. I got 36 pets and I really need loads of tc slots, my vault would be empty if we could buy tc slots directly.

I think this is a very sensible suggestion and I support it.
Definite support, it would suit the general new approach of the site!
My only objection is.. D8 What about the stocking stuffers??!!
Anyways, great idea hope it comes to life
I think how it should work is there are still the MKB in the MC at the same price - where you get the chance of 1-3 slots... and then buying the one slot directly will cost more money.
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Oh yes, I support this :D. This will also solve the OCD problem some of us are suffering from (like keep using MKBs, and hoping that the total slots amount would land on a certain number xD).

lol this^ as well.
I hit 500 perfectly. then goof'd and accidentally used another MKB on the same pet. Now im working towards 600, if it lands on that lol. If not, 1k it is.
I support this idea, but I also agree with others that they should be 75k a piece vs 50k.
The only reason 50k was originally suggested is because, of course, the max number of slots you can get from the box is 3. Whether it's the average or not, that's the max, and at 150k per MKB that's 50k per slot if you get 3. But I can agree that it should be more anyway.
Also to make it a greater sP sink, you could increase the cost of each purchase by 5,000 sP with a capped cost. I.E. (base cost = 75,000 + 5,000/purchase, capped at 150,000).
The extra cost can be reduced by 10,000 if no slots have been purchased for a week or something, and can't get lower than the base cost.
I'm surprised hasn't been pinged yet? :o (or did i totally skip over this? if so, sorry)
I can see this being rather popular

Yes please. I need so many TC slots. I have a small hoard of MKBs stashed in my vault, but I know it's not nearly enough, and the wait times are tedious. I don't see any reason to remove the function from MKBs, though, or even take them out of the MC. Especially if the price for a slot would be higher than 50k.