Bitcoin mining requirements is costly these days. You need to purchase specific hardware in order to mine a block which give you BTC in return, which profits low. If you calculate your electricity and mining equipment purchase, and i believe Antminer is much more costly. This is piece because its decrypts the code of a block faster than a regular GPU.
Not according to some hobbyists if you check out the mining subforum. There are a few people there always sharing their rigs and setup and YES if you set up traditionally you'll be paying a lot for ASICs but if you somehow have a way for clean and cheap energy (like home solar setups that virtually cost nothing except setup) then even cheaper older ASICs are available.