What is required to apply? Do you look for a prototype? Do you look at user growth rate over the past few months? How do you decide if an idea is really good?
It depends. There are many types of SmartBoard installations:
1) SmartBoard is a giant LCD. Never seen this in the wild, but it exists. ~$8k.
2) Control-surface-only SmartBoard with integrated specialized projector. It hangs off the top-front of the board about 2 feet into the room, and covers the SmartBoard frame perfectly. Alignment is less of an issue since it can't move relative to the board. ~$6.5k.
These can be installed on a wall (labor costs) or on a wheeled cart (parts cost).
3) Control-surface-only SmartBoard installed on a wall, projector permanently installed on the ceiling. You (most likely) need a contractor to make the VGA/DVI run, install the projector mount in the ceiling, buy a projector, put the projector on it, align it, get an electrician to run power to the ceiling, etc.
This is what I most commonly see in classrooms. I worked for a contractor one summer, and a team of three of us could do ~4 classrooms in a day.
The board itself is around $2k. Projector + installation probably brings it up to around $3.5k.
4) Control-surface-only SmartBoard installed on a wall, projector sitting on a tabletop or A/V cart. Standing in front of the board to use it casts a shadow. There's an art form to standing the right amount off to the side. Some teachers were good at it, some weren't.
Smart Board would still be around $2k, and you can buy a ~$700 projector that'll do the trick.
I don't know what it costs to wall-mount the board in any of these configurations. Presumably if you have a couple of guys and drills, you can do it yourself and it'll only cost time.
kazinator has a point. mail servers run on reputation. more ppl tag your email as spam, the mail server is going to get blocked out from reaching the inbox. unsubscribe link will not cut it.