Hi Mick
Well, I do know of someone who has rented 25 weeks but I'm sure this is rare.
Otherwise our readers are reporting mixed results (see as to why from my previous comments). Met one of our readers only last week and it's his first year. He's got his own internet site which was up and running a couple of months ago (maybe three months?) and he's got 15 weeks booked from it already. He's a smashing chap and puts in effort, not only to get the business but also exceeding expectations for visitors when they arrive in Bulgaria.
I think that's the way to go; these places won't fill themselves.
Yes, some of the developers have been claiming all sorts of things but in some instances I can't believe people fell for some of the more outrageous claims. I mean, when a developer tells you you're going to get 20% return, what would you think? I can remember when we lived in France and had a self catering unit which we rented out, even there with higher rental prices, higher occupancy and longer season, we generally only brought in 8,000 pounds a year off it and we worked damned hard at it too.
If people are really looking to make money out of rentals then apart from location, location, location; they then have to be realistic about returns and put in the work. It's perfectly possible to achieve but don't underestimate the effort.
Cheers,