IMO the smaller minimum is not for those who are ready to invest, but rather for those who want to try investing first and give it a try before depositing and investing more.
On the other hand, I can see nothing wrong with investing small amounts. It could be a free lunch or a free beer someday :-) I've been there too -- there is nothing better than a free lunch with friends when you get some profit :-)
I think promoting the smallest investment level of 0.005 is a reasonable level for a gambling site, because there are a small percentage of casual gamers, who participate in bitcoin, gamble with just Have fun, so if you raise the odds up too large, they will leave your site. We are not aiming to make a living as the first, because gambling can also be used for entertainment, that is for sure. I think we should keep the deposit at 0.005. That's my opinion, thanks