So who out there is running an investment fund that's looking to make a much more reasonable rate of return off successful but slowly growing companies? Because I would put money into that fund.
Also commercial real estate fits your criteria almost perfectly.
Small slow growing businesses tend not to actually need capital very often, so there isn't exactly a huge market for investing in them.
On the other hand, you get a lot of businesses whose owners are getting old / sick of the business. They need somebody to buy them out and install a new management structure.
There are a bunch of funds who do things like that. Look for "Private Equity" as a more broad category rather than just "Venture Capital".