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Default Leaking Tile Shower

I have seen a lot of posts on this subject, but I still have a lot of
confusion as to what my exact problem may be. Here's the situation:
We have a walk-in tile shower, in a house that was built in 1980. The
shower is on the second floor, and about a year after we moved in we
discovered a horrific site in our basement. It was in a storage area
in the basement directly under our Master Bedroom shower. The area
under our this shower was leeaking water everywhere. It had
lime/calcium deposits built up around where the pipe for the drain was,
so it looked like it had been leaking for a while. (I have included a
link to pictures at the bottom) We were told by several in the
construction field, not necissarily experts in this field, that it is
typical of older 2nd floor tile showers. As the house settles, the
tile begins to crack and the water leaks. We also have had friends
that had a similar situation, which had the shower re-tiled 3 times by
different professionals and still never fixed their leakage problem.
So we first went with the advice of re-grouting the shower, and I made
a trip to lowes, got the materials I needed and gave it a go. This
fixed the problem for about 6 months. We noticed a significant drying
in the basement after the re-grouting, but during the first month or
two, we noticed some of the new grout "flaking" up. After about 6
months it was back to leaking in the basement again. So this time I
sent my wife back to lowes to get some more grout, where she learned
from a guy in the tile dept. that grout needs to be sealed. (I will
admit I know nothing about this subject, so stop laughing.) ;-)

This time I thought I knew it all, we got advice from the lowes guys on
what type of grout to get and how to seal it. I re-grouted the shower
a second time and the grout called for 28 days curing time. So we
didn't use the shower for a month. Then I used a spray grout sealant,
3 coats. This time the leaking stopped for about 2-3 months. I
thought I had it whipped, but this time the grout started flaking up
again, and it was pulling up the old grout when it was coming loose.
So now, we still have a leaking shower and the tile around the edges is
starting to come loose because the grout around the edges is "flaking"
out. (When I say flaking, each time we take a shower little chunks of
the grout is coming loose and as the water hits it it pops out of place
so we have little chunks of grout in the bottom of the shower). So
with no grout in areas around the edges, the tiles on the edges are
beginning to come loose. I know this is bad news because that can only
mean more water escaping and leaking into my basement. The shower
drain is directly over a wall in the basement, one side a storage room,
the other side a bedroom. The bedroom carpet is beginning to get wet,
and we really need to figure out what to do with this shower.

Anyone have any ideas as to what our problem or how much it could cost
us? The main thing I want to avoid is having our shower re-tiled 2 or
3 times and still not stopping the problem. I have taken some pictures
because they say more than I have put into this entire post.
http://www.bentonville.k12.ar.us/mav...wer/shower.htm

Thanks in advance for all your help,
Matt