IMO if you are honestly looking at horses in the $7500 price range and in this day and age with the economy the way it is, you can find an experienced show jumper for about the same price or less. I think you would be better off suited on a larger horse as this horse's jumping style is sloppy and flat and I don't think you will get too far with him. Yes, the kid is folding down too much over that jump and no I don't think that jump is too high for a 4 yr old. If you are considering purchasing him, find out what his training regimen is like (how many days a week is he jumped and for how long, how many days of flat work, how many days hacking? Etc) and also don't forget a pre-purchase exam.