what does it mean in your country?

Dear Warriors,
I'm a newbie planning to develop an online business based on bio/organic/natural/healthy niche.

I just found a premium domain name on Flippa that it seems really interesting because it is a short domain (only 4 letters) and contains the word "Bio" which is widely used in the EU for products related to the above niche.
In fact, it is possible to find the bio logo in the labels of the most expensive products.

The seller states that the domain is a "Remarkable - Rare - Easy to Remember" and it seems he/she is right.
I'm thinking if to buy it or not. It's a .net and I found that the .com was sold in the past for over $ 2.5k and it's not available (I already contacted the owner). The asked price for the premium .net domain is now under $ 700, so it is really interesting also because other extensions (9) are already taken.

I'm sure that the word "bio" in the EU has a great value for my business idea (I see it "everywhere" when I go shopping).

So my question is: what does it mean "bio" in your country?
Could you please let me know the meaning of the word/prefix "bio" in your country?

Should I buy it or not? The fact that the .com was sold in the past for $ 2.5k and now it isn't available anymore it means that the value of the .net is at least $ 2.5k or more?

Many thanks!