Why do they keep doing Dino Megazord? Buyers guide

In 10 years, we've gotten around 20 or so releases of the Dino Megazord, which is more versions than any other Megazord has ever got. So how did that happen?
In what some will be able to use as a buyer's guide, here's the timeline of the last decade of Dino Megazord toys, as well as a reminder of how it all started.
Teleport along the video:
I've given each release a number to help you find your place in the video - please don't believe this is 100% chronological, or comprehensive to the large amount that have been released!
03:44 1 Retrofire Megazord 2009
04:17 2 Zordbuilder Megazord 2010
04:50 3 Legacy Megazord 2013
05:47 4 Super Robot Chogokin Daizyujin 2013
06:04 5 Legacy Megazord version 2 2015
07:00 6 Imaginext Megazord 2015
07:17 7 Imaginext Zord Vehicles 2015-16
07:31 8 Jakks Pacific Big Figs Megazord 2016
07:57 9 Gigantic Series Daizyujin 2016
08:36 10 Legacy 'Build a Megazord' 2017
09:00 11 Super Mini Pla Daizyujin 2017
09:44 12 Soul of Chogokin GX-72 Daizyujin/Megazord 2017
10:15 13 Legacy Collection Zords 2018
11:53 14 Mega Mighties Megazord 2020
12:12 15 Megazord 10" 2020
12:32 16 Buildable Dino Megazord 2020
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Where to buy it
Hasbro's 3 releases will all be available during 2020.
You should still be able to find the Soul of Chogokin GX-72 Daizyujin/Megazord though this too is becoming harder to find.
The other releases will need you to search on the aftermarket.
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Credits and copyright
Most of the toy images used within this video are my own and can be found at:
/ powerrangergram
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Music
The royalty free track used is:
Track: Salon Helga - Broke In Summer [Audio Library Release]
Music provided by Audio Library Plus
Watch: • Salon Helga - Broke In...
Free Download / Stream: alplus.io/salo...
#powerrangers #mightymorphin #megazord