CO2 is good all round

I've read some things saying the amount the Yeast makes is way less than what your intake fan brings in but with a good enough yeast/sugar/water set up you might be able to make enough pure CO2 to see noticeable growth. Some say that with a small scale CO2 yeast generator you can get like 20-30ppm so 1-3 wouldn't hurt since average CO2 in the atmosphere is supposed to be 300ppm.

So if you can raise the CO2 ppm by like 100 for like $5 why not?