Have you thought about going into e-flash cards, it seems like you would have an overlap in customers for this product? And it wouldn't be too much work to create.
SEOwise if it is not bingo then my built in advantage is same regardless. Given that SEO is my main acquisition channel, makes little sense to make next business in nonlucrative niche when I could carve out a spot in a more rewarding niche for similar work.
What I was thinking since you already have a customer base of teachers. You market directly them. You create a product where the teachers create flash cards (math, English, etc)
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They then assign the cards to the students as home work. (The student has to go through the whole deck over and over until he gets all the answers correct.) The teacher is now able to assign home work that grades itself. The students do better on tests because they have memorized the given material. Every one is happy.
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And unlike the bingo cards teachers will pay a monthly fee to use the service. So the revenue is recurring.
Have you thought about going into e-flash cards, it seems like you would have an overlap in customers for this product? And it wouldn't be too much work to create.