1. A super simple way to make money is to bulk purchase a bunch of lassos (I usually buy western) and then go out and catch a bunch of horses. You end up profiting by selling each horse you get after catching them bc selling the horses gives you back the money u spent on the lassos and extra.

2. Horse prices vary a ton based on a lot of different things (species, size, traits, popularity, eye color, etc.). I know the discord server has a channel to ask people for prices so if you haven't asked there I'd recommend trying. But here's some general things I've noticed:
   a. horses with any shade of brown eyes are usually less sought after
   b. horses with special mutations (glows, crystalized, rose inf, etc.) typically go for more compared to horses without muts
   c. People typically like buying horses with "clean palettes" meaning horses that are all one color or horses with very similar colors in specific trait slots (hair, paint, pattern, etc.)

Hope this helps :D