It reminds me of how we laugh at scam emails for being poorly written and obviously a scam, but the theory is that this filters out all but the most gullible people so the conversion rate on anyone that replies is high.

If your business model is taking money from gullible investors, maybe it's reasonable to appear (or actually be) incompetent so that you don't accidentally waste your time on people who haven't drunk the Kool-Aid.