Driven a van there very cheap living costs poor wages and a lot of gypsies - you cant just open a gate and walk on property there it is not acceptable - probably down to low wages and everyone trying to make a few lev - certainly worth going if you keep your wits about you
We went 2yrs ago and will be there again in July with our 2 poodles. Not over run with campsites and most seem to be of a poor standard and quite expensive. There are of course exceptions, we found 2 nice sites owned and run by ex pats.
Sakar-hills campsite is close to the Turkish border and not too far away from the Greek border