I think it is good to use/spend your bitcoin as much as you can, however I don't think it is smart to entrust a third party with so much of your money as you are doing.
If BitWage has any problems I would know about it within hours of missing my paycheck. My paycheck is every other Friday, I usually get an e-mail about 6-7PM on that day with the amount of bitcoins deposited into my account and the rate. If this did not happen I could call them, if they give me the run around I would call my company and have them reverse the direct deposit(which would be a hassle, but possible). And from there I would certainly drop them. So at most, one paycheck is lost if they go under. They don't keep peoples bitcoins though. I gave them my bitcoin address that I have in cold storage, they send to that address immediately once the direct deposit goes through.
For localbitcoins I am getting 10% above the market rate, I get enough for spending money and rent each month.
As for taxes, yes I am avoiding taxes...legally. I live outside the US working for a US company. If you live outside the US for more than 330 days out of the year you qualify for the foreign earned income exclusion. This means that the first $100k of my salary is tax free and I can write off any housing costs. My situation is unique in that I work as a contractor for the US military so I do not have to pay taxes in the country I live in (I can even avoid paying VAT, but usually don't bother with the process).