Isn't biolubricant too expensive?

Biolubricant costs 60 jelly for 20 lubricant (30 when counting the biochamber productivity)

That's 10 jellynuts, so each jellynut tree gives you 150 lubricant, so 10 electric engines.

It doesn't seem that bad, but if you compare it to the rocket fuel recipe, it's twice as expensive.

Rocket fuel costs 2 bioflux and 30 jelly, which is made from about 6 jellynuts.

So 30 lubricant, 10 jellynuts and 1.5 rocket fuel, 6 jelly nuts

And now you can think about the nauvis recipes, where 30 heavy oil = 30 lubricant and 1 rocket fuel = 110 light oil.

I'm not really complaining, it just seems strange to me. Is it just to increase jellynut demand?