Company B likely WON'T sell as it's a job. It'll join the 95% of other such businesses going to market and failing to sell.
If the company were larger, not heavily dependent on the owner/s and showing growth in profit, buyers would factor in that growth, maybe!
In most cases, you'll find them arguing that valuation should be based on average profit over the last 3 years!

They're a crafty lot, buyers.
In the unlikely event that they value based on projections, they'll expect the vendor to share the risk via an Earn Out (EO).
The buyer is not paying for "potential". He's paying for results and he'll pay when those results are actually delivered!
Further, he'll drag out DD and require monthly management figures during the DD period and, if there's the smallest dip in performance or churn rate or profitability or whatever during that time, he'll ask for all projections to be thrown out the window and for the price to be renegotiated. That's the reality of the market, like it or not.
I've been involved, in one way or another, with many, many such deals. Buyers accepting the seller's projections, and paying based on those projections, will demand to pay on results, not expectations.
These are, in fact, worse deals. Most EOs end in dispute!