Modelcraft did that at one point. He also leased the molds for the Shackleton and a couple other kits as well. Revell is one of the companies that will lease out a mold, or run a given amount of a kit for you, given enough to pay for the run, of course. As "iconic" as a Twin Otter is, civilian planes don't sell exceedingly well. Modelcraft did ok on his run of the Twin Otter, but he didn't do it again, which would indicate it wasn't screamingly profitable.
There's not a huge profit margin on model kits, or we'd see wider marketing of them, it's a niche that grows smaller every day.
Alvis 3.1 (intending to occupy the niche until the day I die. And yes, I want a Viking Funeral. Burn my kits, with me on top, and invite all the collectors. That way, there's guaranteed to be tears at my funeral. And clouds of toxic black smoke! :) )