In my understanding, the way this works, is that there is a protein in dry beans that serve as a protection against the bean being eaten by animals, so that it can remain a seed and grow more beans. When the bean is soaked, and begins to sprout, that protein is activated, and it is undigestable to animals, who learn don't eat that thing. By providing an enzyme that either converts starch to sugar, or by fermentation (converting sugar to alcohol), that protein can be pre-digested, to make it digestable by humans.
There really isnt an average number of showings before getting an offer. Some sellers will get an offer on the first showing, others may not get an offer until after the 25th showing.
Nowadays, offers go out before evaluations are even made on many of these kids. If not, then you won't sign many of these prospects. So if you offer a player before making an evaluation, you can see why the so-called offers aren't exactly iron clad. One example is when Chan Gailey came into the college game at Georgia Tech from the NFL. In the NFL, you better be very sure about a player before you draft him, or you will be fired.