Is asking the Tarot something every day too much?
You're asking us a lot of questions about how to use tarot. Here's the thing ... ultimately, only YOU can answer this question. Each of us uses tarot a little differently. One attempts to find out objective truth about a situation. Another to explore their subconscious wishes. Another to attempt to determine a future outcome, and much more.
Some draw everyday. Some draw once a month. Some draw whenever they feel "called" to do so.
This is no right or wrong answer here.
I think what people are trying to say, is that if you ask "big" questions, you need time to reflect, absorb what you've seen, interpret, and think about the cards. That to ask, assume an answer, and immediately move on, is to probably miss the greater learnings. You could spend your entire life working on "what is the meaning of life," depending on how deeply you want to go. If you're drawing in order to grow as a person, then as soon as you have some insight that helps you, and feel like it, draw another card. It can't hurt anything, in my opinion.
I'm doing a daily draw right now in the Deck of the Week group. Just one to three cards, and all about my life situation and/or feelings. Each day I get insight or clarity about what I want, reassurance I'm on the right path, ideas to broaden my perspective, etc. For me, these daily draws are about improving myself, and its very valuable to me.
As to the cards stopping working. I don't believe the cards can start or stop working on their own merit. I believe that when they aren't "working" its that our own mind is burnt out on that deck, that question, or simply needs a break of some kind. Our intuition (or whatever connection) is simply not being accessed. As an artist, a parallel would be that we're feeling a creative slump. Finding it hard to get out of our logical left brain thinking into that creative, intuitive, right brain thinking.
Ultimately, you need to seek and find your own path. There are many paths up the mountain, and none of us can be absolutely certain that the mountain even exists.