Can you give us an example of a commercial bank offering 3% a month or 36% a year interest? That is too good.

1500 satoshi for 30 mins work is too small. It is just useful for learning the basics of bitcoin or low value transactions.

2030 is 15 years from now. If the bitcoin rises 50% a year, it will be $180,000. With 10 bitcoins, you will be a millionaire in 2030.

If the interest is over 3% a month, it is a scam. No business in the world can offer 3% return consistently over a long period.

If we spend a lot of bitcoin to buy goods and do not buy back the coins we spend, there is a chance of price drop.