"....head's" what? Greengrocer alert :-).
You don't know what people give to or how they help others privately. However I agree it is bad when people are evicted from their homes in order to raise rents higher than they can afford, there should be a cap on that. I feel that as long as the mortgage is paid and enough on top of that for repairs, replacements of fittings, agent fees, service charges if flats, etc, that should be sufficient. The property is still an investment and can be sold with tenant, when tenant moves on or at some time in the future.
I let a modern second floor flat (mortgaged), in a very nice area to a working couple who are in their late fifties; it has two bedrooms, one with ensuite plus a 'family bathroom', spacious living room stretching from front to back of small block with windows at either end, very nice fully fitted kitchen, hall, storage, a parking space and visitors' car park. This came about when someone very close died, I didn't set out to own another property and I don't publicise it. On here is OK because I am anonymous. I charge £650 pcm which covers all mentioned in previous paragraph except agent fees because I let privately to people known. My tenants absolutely love it! I have no intention of selling for the foreseeable future but if I did want to they, or their son, would have first refusal. If/when I die mine would do the same.
Am I greedy? I don't think so.
Holiday lets are a different matter of course but I don't think it's a bad idea in principle, it is a way to make a living after all and some people are good at it. I would find that a headache but I'm old :-).