Gulets are usually built to spec, if you want a
cheap one they'll build you a
cheap one, if you want a gold plated one that's what they'll build.
Here are couple of pics that show that they are not all built of pine.
These are planks of Burmese
teak, they will outlast you and most boats on the
water, they will also cost an arm and a leg.
This is a
boat planked with the same material, not a cheap
boat by any measure.
Gulets were built for coastal sailing, they were not built for deep sea sailing. Currently almost all of them are built for coastal
charter work in
Turkey and
Greece, they are purpose built for that role. I don't think I would buy a coastal cruiser for a trans-Atlantic trip.