Not too sure about the odds being 'pretty favorable' (unless I am super unlucky).

Decided to get my last 3 dragons (and only 3 items I have left).

I have done 220 spins (110k) and only gotten one so far...

My total so far on this capsule is $278,500 or 557 spins.

Hard to ballpark the odds since at the start I got a lot of items in a low amount of spins relatively speaking but that's due to there being more items to have won but now with 3 maybe we can better an estimate.

My prizes
60 chairs
76 stools
8 book shelves
1 crystal ball
20 wands
45 card shuffles
1 8 ball
1 hat
1 dragon
Lots of wasted money

these two go hand in hand

Got it after 300k, obtaining the bone dragon morph:

https://i.gyazo.com/22dedfdc08a935b6...acf6cf5bf4.gif

Once you collect them all that dialogue appears over his head.

Would have been a great opportunity for the text to say something along the lines of "Wow! You have all the dragons, too bad i dont have a special prize one, but i do have this dead one!" And then he gives u a dead dragon skeleton and does some magic and makes it alive