Some reason's why a project extend their ICO is they still didnt hit their target amount of token's to be sold and the other is maybe some of the investors requested to extend their token sale because they want to invest more.
They are just being greedy. Ubex and Kakushin have both reached their softcap.
I think they are not, If you own a project or a business and you did not hit your target amount of sales you will also do what they did. Running a business like this is not easy as you think they also give capital and time to succeed on their projects.