From my elementary school understanding of Satellite orbits, I know that GEO satellites are placed in equatorial plane, MEO satellites are placed in an smaller degree inclined plane while LEO satellites are placed in larger degree inclined plane near the poles.
During my research, I found that only O3b MEO satellite constellation is in the equatorial plane. However, I didn't find any LEO satellites constellations that are placed in the equatorial plane. Why is that?
Why are LEO satellites never place in the equatorial place with near 0 degree inclination?
The one reason I get is that since LEO is close to earth, the coverage cone is very small & if placed in the equatorial plane, it will cover only a small percentage of the earth surface & hence will be wasteful expenditure. Aside from money wasting, what other orbital factors prevent LEO satellite placement in equatorial plane?