Oh god have I ever seen this.
I had a "friend" who went through horses like some people go through toilet paper.
For 3 years she had a gorgeous Spotted Draft gelding who was green as grass. Poor ground manners, she was terrified to ride him. She asked me if I could work with him - I'm okay if it's just a simple matter where you need to establish leadership, but I could tell this horse was WAY the hell over my head.
She was a big lady, and convinced she needed a full-sized draft horse. In the past 4 years she's had 10 horses, most of them bought sight unseen from places like the Camelot Horse Weekly page, or Another Chance 4 Horses (which, if you do some Googling, has a less-than-stellar reputation to say the least). One Percheron gelding would have been perfect but she let someone talk her into selling him after she took a fall that wasn't the horse's fault.
After 5 draft horses who didn't work out for one reason or another, she finally got a hold of this GORGEOUS paint gelding. Trained to the nines. My jaw literally dropped when I watched this horse's video.
Of course she got him and...dead lame. It turned out whoever had him last put leather pads on him and never bothered to change them out, and he had a raging fungal infection in all 4 feet. She quickly ran out of money and wound up giving him to a local rescue who thankfully were able to get him sound. His new owners now ride AND drive him. Everyone who had met that horse LOVED him- just a sweet, easygoing guy broke to the hilt. She really missed the boat on that horse, because he would have been perfect.
So of course she's cycled through 4 more horses in that time who were all crazy or unsuitable for one reason or another. She finally happened upon a Percheron gelding she actually got a trainer to help her with, and last I saw she was riding him, although I'm pretty certain she's gotten rid of him now too.
I told her once if she put all the money and time she's wasted on unsuitable horses into finding just one REALLY good, carefully considered horse instead of ten impulse buys, she'd wind up with something amazing.