I put my lessons on hold for a similar reason, £18 for half hour and I had 1 lesson a week hoping to eventually have that as an hour! (do the maths!)
So In answer to your questions, I have taken time off from doing lessons however I did this at a point where I had some goals in mind as set by my lessons, so i've had enough to work on to see me through.
I've also spent a lot of time doing research, looking at studies I don't think it will affect your progress if you still spend time learning. In result, new knowledge gives you new ideas, new goals and continues to motivate.
If you're still doing lessons and you feel you have no direction or motivation maybe you need to question what you're doing right now and make sure it's right for you. If you are attending piano lessons for your own hobby or because you want to, make sure they go in the direction you want to go.
I am yet to go back to my lessons at the moment, but I think you need to remember as long as you're paying for lessons, the relationship between you and your teacher is strictly business. If you have been honest with them and they act rude or insulted, then from a professional perspective, they weren't the right teacher anyway.
I don't know your level but I wouldn't rely 100% on the teacher for progression, you have to go out there and find what works for you, how to play correctly with your hands, how to learn the music correctly to your taste.
I think that the purpose of a piano teacher should be to help us get to where we want to go. not where they want us to be, because then without them how do you progress that way?
Don't be discouraged, just use this time to develop yourself, maybe not even at the piano, but musically and as a person so you can discover where you want to take this talent.
Hope that helps.