A session of O-Cha's better senchas are still only around 1 buck or so. Since I am what Mary has kindly referred to as a careful brewer, I am able to get 5 steeps for each session, 20-25 cents a steep. If you think of it this way, that is really cheap.
I think we have all gone through the calculating mode, I don't do it any more, but one thing I do is try to have one premo sencha open and one everyday sencha open at the same time. This gives me variety but is also more cost effective.
Regarding gyokuro. Yes, if you are going to drink gyokuro everyday, get a second job, it is not cheap. It should not in my opinion be drunk as an everyday tea, but I get a bag or 2 a year, that is it, and then I try to fully enjoy that bag when it is ceremoniously opened. There are cheap gyokuos out there, but with Jpanaese tea, you truly get what you pay for.