i think Bitcoin is only profitable if done at large scales. you must get expensive mining equipment and of course it consumes a lot of electricity monthly. Also its usually much more cost effective to buy Bitcoins with this money instead of using it to buy mining equipment.
Absolutely yes, instead to build a high capacity hardware and software just making a shortcut method, you need to make your own fiat money to invest in BTC. instantly you made an investment that period of time. while you mine of Bitcoin like what you said that's expensive and made along time of you build that kind of equipment.
yes definitely agree with you if you have a big money to start with then you can do mining bitcoin because there are thing need to consider when you start mining bitcoin. first is the electricity consumption and the maintenance of the equipments