i think it can be both a good and a bad idea.
because having the funds is not the only part of having a successful casino. you have to find something that is niche, and then hire some good developers if you don't know how to do it yourself.
in the end if you don't choose a good niche and if you don't know how to promote your service you will lose more money.
I'm pretty sure all of this are the work of a developer. If the design of the bitcoin casino is bad, people won't play that much. But if you've got a pretty creative and skillful dev that can fix bugs right away. Then bitcoin casinos might work for investments.
And for promotion, if you've got a referral/affiliate program, people will advertise/promote your website by themselves.