Okay. Here goes:
Money has time value. One dollar is worth more to you now than it will be a day from now because you can use it now. One dollar a day from now might be worth only, say, 99 cents today. So if you want people to give you more money, you offer them MORE lucrative rates, not less lucrative rates. And if you want money, why would you limit people to what they can buy? That is, if these bonds are profitable for you, which I doubt given that you're only taking them out for two days. A 20% return in two days would be, I think, quite impossible.
In conclusion, I'm not going to trust you with my money haha.