Its a numbers game.
There will be time wasters. You just got to find the ones that are legit, same goes for real life 'seduction'.
When I get the one word replies, I usually just reply with a " :p " and see if she keeps the interaction going which will mean an IOI.
If I know the girl is not really interested. I will bring out the qualification, I will send something a bit challenging to her, this will make or break the interaction. For example:
"If I was alone with your best friend in the whole world, what would he/she tell me about you that you probably won't mention in your profile?, the good and the bad

"
If she still one word replies, Don't waste anymore time, but if she gives you a detailed answer, you will have some investment from her - you are on a good path and just continue to game her.
Good luck