An LOI is not legally binding but still nobody with some level of reputation will give you one if that person is not sure of doing it.
Otherwise if they do it too often their reputation will suffer.
Ideally the LOI should state commitment based on good arguments.
So not something like "we want to look deeper into it" but more like "we see a certain high value of the product and believe there is a big untapped market and we will market it or buy it or whatever.
I think you get what I mean.
But this is just my opinion ;)