Most likely everyone investing in domains has a hope and dream to realize substantial ROI for their domain portfolio.
And if you don’t, then you might need to consider your motive for domain investing in the first place. 🙂
I’m not going to tell you that you can or can’t make a reasonable amount of money buying and selling domains.
The truth is, domain investors can make money, lose money or do a combination of both, hopefully more of the former and less of the latter. 😉