hm, i wouldnt call it huge actually
the 2 ped refiner (ofc, if you refine, you will have decay, so you cant refine 100 000 sweat or so
)
but it is useful to get at least 1k ME to sell
that means, 1000 sweat + 1000 Nexus (would cost about 14 ped atm i think)
thats about 16 ped overall then
besides, if you consider to become a miner anyway, you might go for nexus :P