I got this horse for free. He's a well broke 6 year old grandson of Doc O'Lena. It just takes some shopping around. All we are trying to tell you is if you are going to buy, take your time. There are good horses out there, don't waste your time or money.
I have to agree with the pre purchase exam. If you're selling a horse that's lame, I would hope it's been vetted so you had a reason and you're not selling a guessing a game.
But, if you're looking for something that you can start riding now, getting one that is lame doesn't make much sense. He does look like a nice, and is probably worth if for someone who brought a vet to get a PPE and could chance the investment.
It sounds like you have caught the "can't have just one" bug. You already have a horse. Why not devote your time into that horse? I would guess your time would be better spent doing that than wasting your time and money on a lame horse.
Talk to your parents and take that money you would use of another horse and get some lessons on the horse your already have.
The reason the guy said he didn't get a vet out was because he didn't have the money, which made me wonder if the horse is really worth getting and trying to fix up if the guy didn't get a vet out. Plus the horse had and abcess in one of his hooves over the summer. The more I think about his issues the less I want to get him...
Hmmm, known accesses are also on my "no go" list. They can take months out of riding and wreak havoc on proper growth causing more expensive/frequent farrier visits.
Ever had to soak a horse for months that was a repeat offender? Especially an ornery/young horse? Pain in the rear!
Get him checked, you never know, but for me I would pass pass pass.
I would get personally pass. If you don't want to pass get a PPE that's really comprehensive. I mean get xrays of legs, with an quarter horse cross with intermittent lameness I start thinking the navicular way. Which is expensive to treat and really does limit useable riding. Navicular is difficult to diagnose on radiographs; however, its worth that chance. If you want to jump, I would stay far, far away from this horse.
If you are looking for a nice horse check out a breed rescue. I know a number of horses that are free or very low cost, often ridden english (some jumped) at the standardbred retirement foundation or new Jersey standardbred pleasure horse organization. If that's too far from your location, look at local horse rescues or adoption agencies. You can find some diamonds and because they are looking for good homes rather then good money you get honest appraisals of the horse.
I can understand wanting an already trained horse. You do have to think of what you are going to do with this horse. Are you going to show? Are you going to jump? In which case, double stay away from any lameness. Jumping a horse with bad legs just asks for heartbreak.
Sounds like you've already decided against it, but I also don't think you should get that horse. There's a reason that this "$5,000 horse" is $500, and if the lameness was easy to fix, I'm sure the owner would do it for a better profit margin.
I don't know what kinds of shows you are doing, but I see no reason why you can't show your appaloosa. I looked up your posts and saw the pictures of him, and he's very cute. If you are worried about judges being biased, show eventing, dressage, jumpers. Hunters can be judgemental of appaloosas, but even one of my good friends showed an appaloosa for a while in children's hunters. And she was a good rider too, even went to Washington International Horse Show (not sure if with the appy or a different horse though).
Invest your time/money/energy into the horses you already have. You already know if they are sound and worth investing in.