Well you have a couple of options here you can reject all the answers, you can accept all the answers or you can mix and match as required.
I'm only talking for myself here but I really don't overly care too much either way I do this in an attempt to try to help people and I'm not overly interested in any form of reward other than knowing that I've helped someone.
Honestly Tech Points are fairly useless so I'm happy either way but if you don't close the question it will remain open and you'll keep getting answers at the moment but latter it may count against you as new site developments get rolled out.
There is some discussion about penalizing people for not closing off questions and preventing them from asking further questions until they have closed off the existing ones so I would suggest that you just close the question and accept or reject as you see fit. :D
Col