My opinion on this is..
1) The DK community is tiny compared to popular speed run friendly games.
2) Probably the majority of people who start playing this game give up before reaching the KS due to difficulty.
Sunshine Mario, or whatever its called is a fun console game whereas DK is practically designed to steal your money in the arcade by evidence of the early boards.
3) The boredom factor, seeing a little sausage legged f***er running around girders using semi patterned play with a mundane black back drop pales in comparison to colorful console games where you have a variety of levels, music, enemies and bosses that require different play styles and mechanics to defeat.
4) DK IMO seems to be the type of game where the player is almost never satisfied with their score and while Dean, Wes and Lakeman have pushed the limits I think the scoreboard is still in wild west territory. Once several scores reach max out status I think other variations will become more popular like speed running, no kill screen hack , no hammer etc..
To the average twitch viewer who doesn't understand the game it looks horribly boring, It takes a long time playing to appreciate the artistry of high level play.
5) The randomness (imo) is unsuited for speed running,
That said I have on occasion seen Barra, Danman, ethan and xelnia speed running the game
. I do hope it takes off but I just don't think the appeal is there.
Welcome to the forum!