Hmm, sounds like what you guys are saying is eventually you could have a large enough diameter pipe that the pump wouldn't be able to lift the water.
If you went say 5ft down in a pipe that was... say the size of a swimming pool it would still be the same psi as 5ft down a 1" pipe, just a smaller area so it wouldn't feel like it. Therefore it wouldn't exert any more force on a 3/4" outlet of a pump.
It's all about PSI. 10 PSI on a 4" piston with exert twice as much force as 2" one, but the pump won't have to work any harder.
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