There's your answer. You can farm pumpkins. Basically, EE devalues anything of importance. IMO, you might as well just use TMI at that point.
The pumpkin part I might agree with, but I would note that you have to manually harvest anything other than cactus manually, unless you make a nice large pistion setup (which will actually take quite a long time to pay for itself) unless you are manually picking those pumpkins. All of the biogical objects have relatively low values, and honestly, it is not all that different from burning your metric-ton of sugarcane, powering a mass-fabricator (possibly boosted with scrap made from MORE sugarcane, cactus, or whatnot) and making diamonds that way. Hey, you might as well TMI that as well, since you are getting that for *free*, Because you clearly did not put any effort at all into setting up that automated system, right?
Oh, and considering you sometimes Mine, which also clearly requires no work, especialyl when you use a quarry or miner, That must also be cheating, or the same as TMIing, after all, You are getting it for *free*, no work on your part, right?
/sarcasm
But in all reality, most content mods are nicely balanced in their own reality, but when you add too many together, you can get fun loops of abuse that let you get free materials, (I think it was like, Take gold, turn to glowstone, to cobble, to gold ore, macerate, smelt, get 2 gold bars, etc) which is expected, because maceratior design implies that two bars can be gotten from one piece of ore, while Equivalent exchange says that a gold bar is equal to gold ore plus some energy, so you can easily see where this loop comes from. Its fine with only EE, and fine with only industrialist, and build-craft is quite nice, since it does not add much aside from automation capabilities.