What everybody else said. The problem with a business degree is that it give you the impression that you know how business works. The attachment business used to be open to small fab shops to do a run of buckets or whatever profitably. Now there are so many more being sold and the price has dropped so much, that it's cut throat pricing at the lower levels.
Something higher end (like hammers, demanding attachments, concrete crushers, Nye is one name that comes to mind) is an established company with in house engineers and product development. They can charge what it takes because the performance difference is greater the more complicated and demanding the product.
Basically the market is saturated, you can come up with a good idea and make some money off it by farming out the production. But you're not going to build a business on one good idea, it would have to be revolutionary in a small market, or something with appeal across the whole industry.