Farming 07 [+REP]

I'm a low farming level at the moment (34) I'm making decent prof after seeds etc but tbh I haven't a clue what I'm working towards. Is there anything at a higher level that will make larger profits?

TRIP 1 - Cost (-203,000) - 24 Ranarrs - Profit (+61,000)
TRIP 2 - Cost (-203,000) - 21 Ranarrs - Profit (+28,000)
TRIP 3 - Cost (-203,000) - 20 Ranarrs - Profit (+17,000)

4 x 50k = 200k + 3k = 203k, 24 x 11000 = 264k - 203k = your prof

People were telling me kwuarms make better prof but I don't see how, it just doesn't add up.