Howdy OP,
Lots of megapixels is a "double-edged sword"

. When you set (yes, you can set the pixel count to some extent) the camera to capture with the maximum amount of pixels, you've captured the image with that camera's finest resolution. Now what do you do with all of them

?. Often times you end-up tossing out the vast majority of them when all you end-up doing is posting the shot on the Chameleon Forums

. However, there are times when the "tossing out" action isn't just to end-up with the same exact photo with fewer pixels but where you may have found something interesting in the photo taken that you want to zoom-in on and crop down to just that area of the photo while retaining a reasonable amount of resolution. My avatar photo was cropped from a shot that originally encompassed half of a 2x2x4 screen enclosure to capture my chameleon shooting the superworm off of the screen. The image was sharp enough (good focus, exposure, and depth of field) and was shot with a 6.3MP (the original Digital Rebel from 2004) DSLR such that there was still fine detail of the tongue.
Another series of shots that I took of that same chameleon over the years turned out to be helpful. When he was 5-6 years old, a biopsy of a lump showed that it was cancer (he died a year later). My vet and I were able to look back over years of my photos of that chameleon, zoom-in on that same location on his body and see where the very tiniest spot later turned into the cancer all of those years later. My vet used those photos as part of a paper that he presented at one of big veterinarian conferences.
It's always nice to have the choice to save or toss all of those "extra" pixels

. Just get a good camera and lenses to protect those pixels. You never know when you'll need them

.