I'm not sure, I guess it depends on the person. For me 10mg is enough to give me a pretty good buzz and be satisfied with watching anime for the night. 20-25mg and I'm time traveling. I wouldn't drive on either amount. 5mg is probably _okay_ but still I'd rather just take a cab/lyft/uber/transit.

I think if they could do three things (other than be in my jurisdiction which is currently complicated by laws) I would be an avid customer:

1) Make it taste pretty good with food

2) Make it fizzy

3) Make it not terrible for you (vs soda, juice, alcohol) so you could have a couple at the end of the day / with dinner to de-stress.