Buying lottery tickets and hoping for the best is not a business plan. More to the point, I was wondering why the OP is talking about a business plan when it seems they still know nothing about domains. Nobody should enter a business they are totally unfamiliar with imo. It's putting the cart before the horse.
A business plan could be as simple as a logical sequence on how to make a profit, from the exchange of goods and money.
It could be a one-time event that can never be repeated. For example, selling your antique Picasso. Sometimes, people who earn a profit from "luck", would believe they can duplicate the event. Until they realize and accept the reality, that their "business plan" is
unsustainable.
A business plan that is based on the logic of hits-and-misses and speculation, can be called a "
high risk business plan". For example, electronic makers try to make a business plan to sell 3D television sets, eventhough not much 3D content is available for consumers to utilize a 3D tv. These companies are engaging in speculation. And it's a "high risk" business plan.
As long as a business plan "makes sense", and there is indeed a possibility to earn a profit no matter how risky it may be, then it can still qualify as a business plan.
Ticket Scalpers spend a fortune buying all front-row tickets in events, hoping they could resell them back at inflated prices. If few legit customers come to the event, then the ticket scalpers are forced to sell cheap. And they incur massive losses. On hindsight, it turned out to be a "
bad business plan".
Some business plans don't make sense, at first glance.
For example, Sony sells its PlayStation 3 consoles at a LOSS. Why would anyone sell a merchandise for $300, when it costs $500 to make? It doesn't make sense. But Sony is hoping profits from its other division would compensate for the losses, and use the money spent on PS3 as marketing cost to promote the PS3 platform.