I'm buying ~500$ in Bitcoin every month with part of my salary. I have a stable job and my company is doing good. I'm wondering if it worth to take 20.000$ to buy 2 BTC now and pay the 500$ as loan installment instead of buying sats every month. I believe in the potential of Bitcoin to reach 50k in a couple years, but it wouldn't be possible to buy near half of BTC at the 500$ rate, so this would be something like an "advance". Hypothetically (but still possible in some probability), if BTC collapses and never recover from 8k, I would still be paying this loan for about 3 years but wouldn't starve or something like that, it would just sux for a while, since I still have another source of income. I know it's not the place to ask I will do whatever I think it's best, but if you were in my position, would you do it?
This is not quite reasonable, invest what you could afford. You should happy with your current financial situation. Monthly buy 500$ is pretty good amount and you might consider it as a your future savings. Even bitcoin price back into $3K once again you will not face problems. Because now you are buying from your extra savings. Do not expect high return from bitcoin. It would not favour you always and you might be lose. When you will buy bitcoin with lent amount you have to return your lent amount with any cost on any situation. Life is very hard we don't what would happen on coming days. Just imagine you need huge money tomorrow for some treatment, you may get loan from somewhere. But if you default a loan then it would be difficult, incase if bitcoin dumped you can't sell it instantly.
So my suggestion is be happy with whatever you have. Don't be greedy, it would throw you to hell.