what further development can you offer?

If you invest, it's going to make you smarter.
Imagine investing in something and it actually made you smarter.
Like, all you had to do was plunk down $100 into something and it automatically raised your IQ points.
I'm assuming its proportional. So like $100 = +1 IQ and $1000 = +10.
Maybe it works on a logarithmic scale; can't have somebody gaining +100 IQ just because they put down $10,000.