Oh you're right, totally slipped my mind - we should offer draw action too.
It's still more common than the more detailed breakdown (ie "Fighter A by x-round KO" or "Fighter B by decision") but it's not quite as common as the four-option system. Definitely something that's fun to include when available, as draw lines are always juicy (the floor is like 20/1 - and that's for pick'em fights expected to go long
)
If you want to include a full array of options on your events, power to you, but I would just advise against falling in love with a single site and getting disappointed when suddenly you can't find detailed odds on a particular fight or fights.