OK, this is easy to say as I will not risk anything, but if I had say a million dollars I could easily invest a reasonable percentage on Steem, say 50K, especially now that it is so low, of course it could crash for good but I think it will probably go back up and then you could take out the amount you put in and just leave the profits working here.
As for self votes, in my opinion if you have invested you have a right to do it, of course in a reasonable manner (that one is good, I guess reasonable may have a lot of meanings) and also giving back to the community by up voting other posts would be good.