I wouldn't necessarily be trying my hand at business. I've got four years under my belt self-employed. What I'm trying to get away from is the irregularity that the changing markets due to COVID, money printer go brrrrrrr, supply chain disruptions, etc have brought to my business. I've had six figure years, I've had sub $40,000 years. To start, I'd love to get an additional 50k/year of income. At that point my bills are paid and I'm living comfortably. I can do my auction gig, probably enjoy it more because I wouldn't relying on it solely to pay my bills and go from there with a second business, rental properties, investing, etc...
As you said, luckily, I don't make stupid purchases. I could buy my dream truck in cash right now and I'm driving a 2k prius and a 3k Silverado 3500 gasser for towing my purchases home from the auctions because in my mind, if I'm smart now maybe in 5-10 years I'll have that new truck paid for towing a Cigarette Top Gun, working 30 hours a week enjoying myself.
My next purchase, and something that will get paid for out of this money but already budgeted for is a 2-3 car wedge trailer. I'm having to go a lot further for inventory these days.